arm64: dts: st: Add interrupt parent to pinctrl on stm32mp251

Add exti1 as interrupt parent for the two pin controllers.  Add the
additional required property st,syscfg.

Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240415134926.1254428-12-antonio.borneo@foss.st.com

Author: AntonioBorneo

arch/arm64/boot/dts/st/stm32mp251.dtsi

@@ -271,6 +271,8 @@
 			#size-cells = <1>;
 			compatible = "st,stm32mp257-pinctrl";
 			ranges = <0 0x44240000 0xa0400>;
+			interrupt-parent = <&exti1>;
+			st,syscfg = <&exti1 0x60 0xff>;
 			pins-are-numbered;
 
 			gpioa: gpio@44240000 {
@@ -400,6 +402,8 @@
 			#size-cells = <1>;
 			compatible = "st,stm32mp257-z-pinctrl";
 			ranges = <0 0x46200000 0x400>;
+			interrupt-parent = <&exti1>;
+			st,syscfg = <&exti1 0x60 0xff>;
 			pins-are-numbered;
 
 			gpioz: gpio@46200000 {