boards: st: fix STM32G0 boards DTS files coding style

Fix board DTS coding style issues to prevent they spread when a	new
board is introduced and used this DTS as example start point.

Issues addressed from Zephyr devicetree style guidelines [1]:
- Insert a single empty line to separate nodes at the same hierarchy level.

No functional change.

Link: https://docs.zephyrproject.org/latest/contribute/style/devicetree.html [1]
Signed-off-by: Etienne Carriere <etienne.carriere@st.com>

boards/st/nucleo_g031k8/nucleo_g031k8.dts

@@ -22,6 +22,7 @@
 
 	leds: leds {
 		compatible = "gpio-leds";
+
 		green_led_3: led_3 {
 			gpios = <&gpioc 6 GPIO_ACTIVE_HIGH>;
 			label = "User LD3";

boards/st/nucleo_g070rb/nucleo_g070rb.dts

@@ -25,6 +25,7 @@
 
 	leds: leds {
 		compatible = "gpio-leds";
+
 		green_led_1: led_4 {
 			gpios = <&gpioa 5 GPIO_ACTIVE_HIGH>;
 			label = "User LD4";
@@ -33,6 +34,7 @@
 
 	gpio_keys {
 		compatible = "gpio-keys";
+
 		user_button: button {
 			label = "User";
 			gpios = <&gpioc 13 GPIO_ACTIVE_LOW>;
@@ -101,6 +103,7 @@
 &timers3 {
 	st,prescaler = <10000>;
 	status = "okay";
+
 	pwm3: pwm {
 		status = "okay";
 		pinctrl-0 = <&tim3_ch1_pa6>;

boards/st/nucleo_g071rb/nucleo_g071rb.dts

@@ -23,9 +23,9 @@
 		zephyr,flash = &flash0;
 	};
 
-
 	leds: leds {
 		compatible = "gpio-leds";
+
 		green_led_1: led_4 {
 			gpios = <&gpioa 5 GPIO_ACTIVE_HIGH>;
 			label = "User LD4";
@@ -34,6 +34,7 @@
 
 	gpio_keys {
 		compatible = "gpio-keys";
+
 		user_button: button {
 			label = "User";
 			gpios = <&gpioc 13 GPIO_ACTIVE_LOW>;
@@ -107,6 +108,7 @@
 &timers3 {
 	st,prescaler = <10000>;
 	status = "okay";
+
 	pwm3: pwm {
 		status = "okay";
 		pinctrl-0 = <&tim3_ch1_pa6>;

boards/st/nucleo_g0b1re/nucleo_g0b1re.dts

@@ -27,6 +27,7 @@
 
 	leds: leds {
 		compatible = "gpio-leds";
+
 		green_led_1: led_4 {
 			gpios = <&gpioa 5 GPIO_ACTIVE_HIGH>;
 			label = "User LD4";
@@ -35,6 +36,7 @@
 
 	gpio_keys {
 		compatible = "gpio-keys";
+
 		user_button: button {
 			label = "User";
 			gpios = <&gpioc 13 GPIO_ACTIVE_LOW>;
@@ -115,6 +117,7 @@ zephyr_udc0: &usb {
 &timers3 {
 	st,prescaler = <10000>;
 	status = "okay";
+
 	pwm3: pwm {
 		status = "okay";
 		pinctrl-0 = <&tim3_ch1_pb4>;
@@ -125,6 +128,7 @@ zephyr_udc0: &usb {
 &timers15 {
 	st,prescaler = <10000>;
 	status = "okay";
+
 	pwm15: pwm {
 		status = "okay";
 		pinctrl-0 = <&tim15_ch1_pb14>;
@@ -205,14 +209,17 @@ zephyr_udc0: &usb {
 			reg = <0x00000000 DT_SIZE_K(48)>;
 			read-only;
 		};
+
 		slot0_partition: partition@C000 {
 			label = "image-0";
 			reg = <0x0000C000 DT_SIZE_K(200)>;
 		};
+
 		slot1_partition: partition@3E000 {
 			label = "image-1";
 			reg = <0x0003E000 DT_SIZE_K(200)>;
 		};
+
 		/* final 64KiB reserved for app storage partition */
 		storage_partition: partition@70000 {
 			label = "storage";

boards/st/stm32g0316_disco/stm32g0316_disco.dts

@@ -28,6 +28,7 @@
 
 	leds {
 		compatible = "gpio-leds";
+
 		green_led_1: led_2 {
 			gpios = <&gpioa 12 GPIO_ACTIVE_LOW>;
 			label = "User LD2";
@@ -36,6 +37,7 @@
 
 	gpio_keys {
 		compatible = "gpio-keys";
+
 		user_button: button {
 			label = "User";
 			gpios = <&gpioa 0 GPIO_ACTIVE_LOW>;

boards/st/stm32g071b_disco/stm32g071b_disco.dts

@@ -23,18 +23,22 @@
 
 	leds {
 		compatible = "gpio-leds";
+
 		red_led_4: led4 {
 			gpios = <&gpiod 9 GPIO_ACTIVE_HIGH>;
 			label = "TO_REC";
 		};
+
 		red_led_5: led5 {
 			gpios = <&gpiod 8 GPIO_ACTIVE_HIGH>;
 			label = "TO_PLUG";
 		};
+
 		green_led_6: led6 {
 			gpios = <&gpiod 5 GPIO_ACTIVE_HIGH>;
 			label = "SINK_SPY";
 		};
+
 		green_led_7: led7 {
 			gpios = <&gpioc 12 GPIO_ACTIVE_HIGH>;
 			label = "SOURCE";
@@ -43,26 +47,31 @@
 
 	gpio_keys {
 		compatible = "gpio-keys";
+
 		joy_sel: button0 {
 			label = "JOY_SEL";
 			gpios = <&gpioc 0 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
 			zephyr,code = <INPUT_KEY_ENTER>;
 		};
+
 		joy_left: button1 {
 			label = "JOY_LEFT";
 			gpios = <&gpioc 1 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
 			zephyr,code = <INPUT_KEY_LEFT>;
 		};
+
 		joy_down: button2 {
 			label = "JOY_DOWN";
 			gpios = <&gpioc 2 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
 			zephyr,code = <INPUT_KEY_DOWN>;
 		};
+
 		joy_right: button3 {
 			label = "JOY_RIGHT";
 			gpios = <&gpioc 3 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
 			zephyr,code = <INPUT_KEY_RIGHT>;
 		};
+
 		joy_up: button4 {
 			label = "JOY_UP";
 			gpios = <&gpioc 4 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
@@ -72,6 +81,7 @@
 
 	cc_config {
 		compatible = "gpio-leds";
+
 		encc1 {
 			gpios = <&gpiob 10 GPIO_ACTIVE_HIGH>;
 			label = "ENCC1";

boards/st/stm32g081b_eval/stm32g081b_eval.dts

@@ -22,18 +22,22 @@
 
 	leds {
 		compatible = "gpio-leds";
+
 		led_1: led1 {
 			gpios = <&gpiod 5 GPIO_ACTIVE_HIGH>;
 			label = "LED1";
 		};
+
 		led_2: led2 {
 			gpios = <&gpiod 6 GPIO_ACTIVE_HIGH>;
 			label = "LED2";
 		};
+
 		led_3: led3 {
 			gpios = <&gpiod 8 GPIO_ACTIVE_HIGH>;
 			label = "LED3";
 		};
+
 		led_4: led4 {
 			gpios = <&gpiod 9 GPIO_ACTIVE_HIGH>;
 			label = "LED4";
@@ -42,26 +46,31 @@
 
 	gpio_keys {
 		compatible = "gpio-keys";
+
 		joy_sel: button0 {
 			label = "JOY_SEL";
 			gpios = <&gpioa 0 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
 			zephyr,code = <INPUT_KEY_ENTER>;
 		};
+
 		joy_left: button1 {
 			label = "JOY_LEFT";
 			gpios = <&gpioc 8 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
 			zephyr,code = <INPUT_KEY_LEFT>;
 		};
+
 		joy_down: button2 {
 			label = "JOY_DOWN";
 			gpios = <&gpioc 3 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
 			zephyr,code = <INPUT_KEY_DOWN>;
 		};
+
 		joy_right: button3 {
 			label = "JOY_RIGHT";
 			gpios = <&gpioc 7 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
 			zephyr,code = <INPUT_KEY_RIGHT>;
 		};
+
 		joy_up: button4 {
 			label = "JOY_UP";
 			gpios = <&gpioc 2 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
@@ -121,6 +130,7 @@
 
 &timers15 {
 	status = "okay";
+
 	pwm15: pwm {
 		status = "okay";
 		pinctrl-0 = <&tim15_ch1_pc1>;