arm64: dts: exynos: gs101: add pmu-intr-gen syscon node

Add syscon node for the PMU Interrupt Generation registers.

Additionally update the exynos-pmu node to provide a phandle
to pmu-intr-gen syscon.

These registers are required for CPU hotplug to be functional.

Signed-off-by: Peter Griffin <[email protected]>
Link: https://lore.kernel.org/r/20250506-contrib-pg-cpu-hotplug-suspend2ram-fixes-v1-v4-4-9f64a2657316@linaro.org
Signed-off-by: Krzysztof Kozlowski <[email protected]>

Author: petegriffin

arch/arm64/boot/dts/exynos/google/gs101.dtsi

@@ -1405,6 +1405,7 @@
 		pmu_system_controller: system-controller@17460000 {
 			compatible = "google,gs101-pmu", "syscon";
 			reg = <0x17460000 0x10000>;
+			google,pmu-intr-gen-syscon = <&pmu_intr_gen>;
 
 			poweroff: syscon-poweroff {
 				compatible = "syscon-poweroff";
@@ -1434,6 +1435,11 @@
 			};
 		};
 
+		pmu_intr_gen: syscon@17470000 {
+			compatible = "google,gs101-pmu-intr-gen", "syscon";
+			reg = <0x17470000 0x10000>;
+		};
+
 		pinctrl_gpio_alive: pinctrl@174d0000 {
 			compatible = "google,gs101-pinctrl";
 			reg = <0x174d0000 0x00001000>;