arm64: dts: rockchip: enable gpu on rk3399-puma

Set the supplying regulator and enable the gpu node on the rk3399-puma som.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20191023223954.3139-1-heiko@sntech.de

arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi

@@ -165,6 +165,11 @@ &gmac {
 	status = "okay";
 };
 
+&gpu {
+	mali-supply = <&vdd_gpu>;
+	status = "okay";
+};
+
 &i2c0 {
 	status = "okay";
 	i2c-scl-rising-time-ns = <168>;