ARM: dts: Add PD entry to MFC codec on exynos5420

PD entry was missing in MFC codec node.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Reviewed-by : Arun Kumar K <arun.kk@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos5420.dtsi

@@ -151,6 +151,7 @@ mfc: codec@11000000 {
 		interrupts = <0 96 0>;
 		clocks = <&clock CLK_MFC>;
 		clock-names = "mfc";
+		samsung,power-domain = <&mfc_pd>;
 	};
 
 	mmc_0: mmc@12200000 {