arm64: tegra: Enable PMC wake events on Tegra194

Wake events are a feature that allows the interrupt and GPIO controllers
to be powered off as part of system sleep. The PMC which is always on is
monitoring these wake events and can power up subsequent controllers as
necessary to process them.
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra194.dtsi

@@ -411,7 +411,7 @@ pwm4: pwm@c340000 {
 			#pwm-cells = <2>;
 		};
 
-		pmc@c360000 {
+		pmc: pmc@c360000 {
 			compatible = "nvidia,tegra194-pmc";
 			reg = <0x0c360000 0x10000>,
 			      <0x0c370000 0x10000>,
@@ -419,6 +419,9 @@ pmc@c360000 {
 			      <0x0c390000 0x10000>,
 			      <0x0c3a0000 0x10000>;
 			reg-names = "pmc", "wake", "aotag", "scratch", "misc";
+
+			#interrupt-cells = <2>;
+			interrupt-controller;
 		};
 
 		host1x@13e00000 {