ARM: dts: Add GPIO irq support to STM32F429

Signed-off-by: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32f429.dtsi

@@ -190,6 +190,8 @@ pin-controller {
 			#size-cells = <1>;
 			compatible = "st,stm32f429-pinctrl";
 			ranges = <0 0x40020000 0x3000>;
+			interrupt-parent = <&exti>;
+			st,syscfg = <&syscfg 0x8>;
 			pins-are-numbered;
 
 			gpioa: gpio@40020000 {