boards: nxp: frdm_mcxa153: Support pwm for NXP frdm_mcxa153 board

Support pwm for NXP frdm_mcxa153 board.
Test with tests/drivers/pwm/pwm_api.

Signed-off-by: Neil Chen <cheng.chen_1@nxp.com>

boards/nxp/frdm_mcxa153/frdm_mcxa153-pinctrl.dtsi

@@ -7,6 +7,15 @@
 #include <nxp/mcx/MCXA153VLH-pinctrl.h>
 
 &pinctrl {
+	pinmux_flexpwm0_pwm0: pinmux_flexpwm0_pwm0 {
+		group0 {
+			pinmux = <PWM0_A0_P3_6>,
+				<PWM0_B0_P3_7>;
+			slew-rate = "fast";
+			drive-strength = "low";
+		};
+	};
+
 	pinmux_lpuart0: pinmux_lpuart0 {
 		group0 {
 			pinmux = <LPUART0_RXD_P0_2>,

boards/nxp/frdm_mcxa153/frdm_mcxa153.dts

@@ -20,6 +20,7 @@
 		led2 = &blue_led;
 		sw0 = &user_button_2;
 		sw1 = &user_button_3;
+		pwm-0 = &flexpwm0_pwm0;
 	};
 
 	chosen {
@@ -93,6 +94,12 @@
 	};
 };
 
+&flexpwm0_pwm0 {
+	status = "okay";
+	pinctrl-0 = <&pinmux_flexpwm0_pwm0>;
+	pinctrl-names = "default";
+};
+
 &gpio0 {
 	status = "okay";
 };

boards/nxp/frdm_mcxa153/frdm_mcxa153.yaml

@@ -17,5 +17,6 @@ supported:
   - dma
   - flash
   - gpio
+  - pwm
   - uart
 vendor: nxp