ARM: dts: Add clock provider information for DP controller in Exynos5250 SoC

Adds clock provider information for DP controller required by CCF.
Signed-off-by: Vikas Sajjan <vikas.sajjan@linaro.org>
Signed-off-by: Arun Kumar K <arun.kk@samsung.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos5250.dtsi

@@ -651,6 +651,8 @@ dp-controller {
 		reg = <0x145b0000 0x1000>;
 		interrupts = <10 3>;
 		interrupt-parent = <&combiner>;
+		clocks = <&clock 342>;
+		clock-names = "dp";
 		#address-cells = <1>;
 		#size-cells = <0>;