ARM: dts: rockchip: add cpu0-regulator on rk3066a-marsboard

The rk3066 also has operating points now, but without adjusting
the cpu-regulator will break once higher voltages are needed for
a specific frequency, so add the needed cpu0-regulator.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3066a-marsboard.dts

@@ -83,6 +83,10 @@
 	};
 };
 
+&cpu0 {
+	cpu0-supply = <&vdd_arm>;
+};
+
 &i2c1 {
 	status = "okay";
 	clock-frequency = <400000>;