ARM: dts: exynos: Add #sound-dai-cells property to hdmi node in exynos5250.dtsi

This property is required for specifying link between the HDMI IP block
and the SoC's audio subsystem.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

arch/arm/boot/dts/exynos5250.dtsi

@@ -698,6 +698,7 @@ hdmi: hdmi@14530000 {
 					"sclk_hdmiphy", "mout_hdmi";
 			samsung,syscon-phandle = <&pmu_system_controller>;
 			phy = <&hdmiphy>;
+			#sound-dai-cells = <0>;
 			status = "disabled";
 		};