arm64: tegra: Enable CPU idle support for P2530

Enable CPU idle support for the P2530 module

Change-Id: Ia73f192b3450fe9c143fbaaea03d6a50527927a7

arch/arm64/boot/dts/nvidia/tegra210-p2530.dtsi

@@ -72,6 +72,12 @@
 		cpu@3 {
 			enable-method = "psci";
 		};
+
+		idle-states {
+			cpu-sleep {
+				status = "okay";
+			};
+		};
 	};
 
 	psci {