ARM: dts: exynos: correct HDMI phy compatible in Exynos4

The HDMI phy compatible was missing vendor prefix.

Fixes: ed80d4cab772 ("ARM: dts: add hdmi related nodes for exynos4 SoCs")
Cc: <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

arch/arm/boot/dts/exynos4.dtsi

···
 			status = "disabled";
 
 			hdmi_i2c_phy: hdmiphy@38 {
-				compatible = "exynos4210-hdmiphy";
+				compatible = "samsung,exynos4210-hdmiphy";
 				reg = <0x38>;
 			};
 		};