Audio Binding for Arndale boards

Required properties:
- compatible : Can be one of the following:
		"samsung,arndale-rt5631",
		"samsung,arndale-wm1811"

- samsung,audio-cpu: 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

Arndale Boards has many audio daughter cards, one of them is
rt5631/alc5631. Below example shows audio bindings for rt5631/
alc5631 based codec.

Example:

sound {
		compatible = "samsung,arndale-rt5631";

		samsung,audio-cpu = <&i2s0>
		samsung,audio-codec = <&rt5631>;
};