arm64: dts: add support for C3 power domain controller

Enable power domain controller for Amlogic C3 SoC
Signed-off-by: Xianwei Zhao <xianwei.zhao@amlogic.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20230707003710.2667989-5-xianwei.zhao@amlogic.comSigned-off-by: Neil Armstrong <neil.armstrong@linaro.org>

arch/arm64/boot/dts/amlogic/amlogic-c3.dtsi

@@ -47,6 +47,15 @@ xtal: xtal-clk {
 		#clock-cells = <0>;
 	};
 
+	sm: secure-monitor {
+		compatible = "amlogic,meson-gxbb-sm";
+
+		pwrc: power-controller {
+			compatible = "amlogic,c3-pwrc";
+			#power-domain-cells = <1>;
+		};
+	};
+
 	soc {
 		compatible = "simple-bus";
 		#address-cells = <2>;