boards: arm: nucleo_wba52cg: enable watchdog for nucleo wba52cg

Enable watchdog for Nucleo WBA52CG

Signed-off-by: Guillaume Gautier <guillaume.gautier-ext@st.com>

boards/arm/nucleo_wba52cg/doc/nucleo_wba52cg.rst

@@ -175,6 +175,8 @@ The Zephyr nucleo_wba52cg board configuration supports the following hardware fe
 +-----------+------------+-------------------------------------+
 | ADC       | on-chip    | adc                                 |
 +-----------+------------+-------------------------------------+
+| WATCHDOG  | on-chip    | independent watchdog                |
++-----------+------------+-------------------------------------+
 | RNG       | on-chip    | True Random number generator        |
 +-----------+------------+-------------------------------------+
 

boards/arm/nucleo_wba52cg/nucleo_wba52cg.dts

@@ -47,6 +47,10 @@
 	};
 };
 
+&clk_lsi {
+	status = "okay";
+};
+
 &clk_lse {
 	status = "okay";
 };
@@ -74,6 +78,10 @@
 	apb7-prescaler = <1>;
 };
 
+&iwdg {
+	status = "okay";
+};
+
 &usart1 {
 	pinctrl-0 = <&usart1_tx_pb12 &usart1_rx_pa8>;
 	pinctrl-names = "default";

boards/arm/nucleo_wba52cg/nucleo_wba52cg.yaml

@@ -10,6 +10,7 @@ supported:
   - i2c
   - spi
   - adc
+  - watchdog
   - rng
   - arduino_gpio
   - arduino_i2c