ARM: dts: owl-s500: Add SPS node

Add Smart Power System node for PM domains.
Signed-off-by: Andreas Färber <afaerber@suse.de>

arch/arm/boot/dts/owl-s500.dtsi

@@ -176,5 +176,11 @@ timer: timer@b0168000 {
 			             <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>;
 			interrupt-names = "2hz0", "2hz1", "timer0", "timer1";
 		};
+
+		sps: power-controller@b01b0100 {
+			compatible = "actions,s500-sps";
+			reg = <0xb01b0100 0x100>;
+			#power-domain-cells = <1>;
+		};
 	};
 };