Audio Binding for Snow boards

Required properties:
- compatible : Can be one of the following,
			"google,snow-audio-max98090" or
			"google,snow-audio-max98091" or
			"google,snow-audio-max98095"
- samsung,i2s-controller: The phandle of the Samsung I2S controller
- samsung,audio-codec: The phandle of the audio codec

Optional:
- samsung,model: The name of the sound-card

Example:

sound {
		compatible = "google,snow-audio-max98095";

		samsung,model = "Snow-I2S-MAX98095";
		samsung,i2s-controller = <&i2s0>;
		samsung,audio-codec = <&max98095>;
};