ARM: dts: add mixer clocks to mixer node for Exynos5250

This patch adds the mixer clocks to the mixer node in the
exynos 5250 dts file.
Signed-off-by: NSean Paul <seanpaul@chromium.org>
Signed-off-by: NRahul Sharma <rahul.sharma@samsung.com>
Reviewed-by: NTomasz Figa <t.figa@samsung.com>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos5250.dtsi

@@ -623,6 +623,8 @@
 		compatible = "samsung,exynos5250-mixer";
 		reg = <0x14450000 0x10000>;
 		interrupts = <0 94 0>;
+		clocks = <&clock 343>, <&clock 136>;
+		clock-names = "mixer", "sclk_hdmi";
 	};
 
 	dp_phy: video-phy@10040720 {