ARM: dts: rockchip: add cpu power supply for rv1108 evb

The cpu is powered by regulator vdd_core on RV1108 evalution
board. Add it to the cpu dt node.
Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rv1108-evb.dts

@@ -103,6 +103,10 @@ vcc_sys: vsys-regulator {
 	};
 };
 
+&cpu0 {
+	cpu-supply = <&vdd_core>;
+};
+
 &i2c0 {
 	status = "okay";
 	i2c-scl-rising-time-ns = <275>;