ARM: dts: rockchip: add the panel power supply for rk3288-evb board with rk808 pmu

Panel regulator is controller by a regulator of the rk808 pmic.

Signed-off-by: Yakir Yang <ykk@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3288-evb-rk808.dts

@@ -233,3 +233,7 @@
 		};
 	};
 };
+
+&panel {
+	power-supply = <&vcc_lcd>;
+};