arm64: tegra: Make the RTC a wakeup source on Jetson TX2

The RTC found on the MAX77620 PMIC can be used as a wakeup source on
Jetson TX2, which is useful to wake the system from suspend at a given
time.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi

@@ -221,7 +221,8 @@ pmic: pmic@3c {
 				compatible = "maxim,max77620";
 				reg = <0x3c>;
 
-				interrupts = <GIC_SPI 209 IRQ_TYPE_LEVEL_HIGH>;
+				interrupt-parent = <&pmc>;
+				interrupts = <24 IRQ_TYPE_LEVEL_LOW>;
 				#interrupt-cells = <2>;
 				interrupt-controller;