ARM: tegra: add system-power-controller property for PMIC node

Add system-power-controller property to system PMIC, ams AS3722,
node to enable power off functionality through PMIC.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

arch/arm/boot/dts/tegra124-venice2.dts

@@ -616,6 +616,8 @@ as3722: as3722@40 {
 			reg = <0x40>;
 			interrupts = <0 86 IRQ_TYPE_LEVEL_HIGH>;
 
+			ams,system-power-controller;
+
 			#interrupt-cells = <2>;
 			interrupt-controller;