ARM: dts: Add CODEC MCLK for SMDK5250

There is a 16.934MHz fixed rate clock connected to MCLK1 on the CODEC, add
this to the device tree bindings.
Signed-off-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos5250-smdk5250.dts

@@ -77,6 +77,9 @@ wm8994: wm8994@1a {
 			gpio-controller;
 			#gpio-cells = <2>;
 
+			clocks = <&codec_mclk>;
+			clock-names = "MCLK1";
+
 			AVDD2-supply = <&vdd>;
 			CPVDD-supply = <&vdd>;
 			DBVDD-supply = <&dbvdd>;
@@ -271,5 +274,11 @@ xxti {
 			compatible = "samsung,clock-xxti";
 			clock-frequency = <24000000>;
 		};
+
+		codec_mclk: codec-mclk {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <16934000>;
+		};
 	};
 };