ARM: dts: stm32: Add watchdog support for STM32F429 eval board

This patch adds watchdog support for STM32x9I-Eval board.
Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32429i-eval.dts

@@ -157,6 +157,11 @@ &i2c1 {
 	status = "okay";
 };
 
+&iwdg {
+	status = "okay";
+	timeout-sec = <32>;
+};
+
 &ltdc {
 	status = "okay";
 	pinctrl-0 = <&ltdc_pins>;