ARM: dts: add pmu syscon handle to exynos5420 hdmi

Add PMU syscon handle to HDMI dt node for controlling
PHY Enable/Disable bit.
Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos5420.dtsi

@@ -663,6 +663,7 @@ hdmi: hdmi@14530000 {
 		clock-names = "hdmi", "sclk_hdmi", "sclk_pixel",
 			"sclk_hdmiphy", "mout_hdmi";
 		phy = <&hdmiphy>;
+		samsung,syscon-phandle = <&pmu_system_controller>;
 		status = "disabled";
 	};