arm64: dts: meson: a1: add secure power domain controller

Enable power domain controller for Meson A1 SoC.
Signed-off-by: Jianxin Pan <jianxin.pan@amlogic.com>
Link: https://lore.kernel.org/r/1579087831-94965-5-git-send-email-jianxin.pan@amlogic.comSigned-off-by: Kevin Hilman <khilman@baylibre.com>

arch/arm64/boot/dts/amlogic/meson-a1.dtsi

@@ -60,6 +60,12 @@ linux,cma {
 
 	sm: secure-monitor {
 		compatible = "amlogic,meson-gxbb-sm";
+
+		pwrc: power-controller {
+			compatible = "amlogic,meson-a1-pwrc";
+			#power-domain-cells = <1>;
+			status = "okay";
+		};
 	};
 
 	soc {