arm64: dts: amlogic: a4: add power domain controller node

Add power domain controller node for Amlogic A4 SoC

Signed-off-by: Xianwei Zhao <xianwei.zhao@amlogic.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240529-a4_secpowerdomain-v2-3-47502fc0eaf3@amlogic.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

arch/arm64/boot/dts/amlogic/amlogic-a4.dtsi

@@ -4,6 +4,7 @@
  */
 
 #include "amlogic-a4-common.dtsi"
+#include <dt-bindings/power/amlogic,a4-pwrc.h>
 / {
 	cpus {
 		#address-cells = <2>;
@@ -37,4 +38,13 @@
 			enable-method = "psci";
 		};
 	};
+
+	sm: secure-monitor {
+		compatible = "amlogic,meson-gxbb-sm";
+
+		pwrc: power-controller {
+			compatible = "amlogic,a4-pwrc";
+			#power-domain-cells = <1>;
+		};
+	};
 };