ARM: dts: exynos: Enable GPU/Mali T604 on Arndale board

Tested with kmscube and some glmark2* tests on arndale board.
Signed-off-by: NGuillaume Gardet <guillaume.gardet@arm.com>
Signed-off-by: NKrzysztof Kozlowski <krzk@kernel.org>

arch/arm/boot/dts/exynos5250-arndale.dts

@@ -543,6 +543,11 @@
 	status = "okay";
 };
 
+&mali {
+	mali-supply = <&buck4_reg>;
+	status = "okay";
+};
+
 &mixer {
 	status = "okay";
 };