Samsung SMDK audio complex

Required properties:
- compatible : "samsung,smdk-wm8994"
- samsung,i2s-controller: The phandle of the Samsung I2S0 controller
- samsung,audio-codec: The phandle of the WM8994 audio codec
Example:

sound {
		compatible = "samsung,smdk-wm8994";

		samsung,i2s-controller = <&i2s0>;
		samsung,audio-codec = <&wm8994>;
};