* Atmel at91sam9x5ek wm8731 audio complex

Required properties:
  - compatible: "atmel,sam9x5-wm8731-audio"
  - atmel,model: The user-visible name of this sound complex.
  - atmel,ssc-controller: The phandle of the SSC controller
  - atmel,audio-codec: The phandle of the WM8731 audio codec
  - atmel,audio-routing: A list of the connections between audio components.
    Each entry is a pair of strings, the first being the connection's sink,
    the second being the connection's source.

Available audio endpoints for the audio-routing table:

Board connectors:
 * Headphone Jack
 * Line In Jack

wm8731 pins:
cf Documentation/devicetree/bindings/sound/wlf,wm8731.yaml

Example:
sound {
	compatible = "atmel,sam9x5-wm8731-audio";

	atmel,model = "wm8731 @ AT91SAM9X5EK";

	atmel,audio-routing =
		"Headphone Jack", "RHPOUT",
		"Headphone Jack", "LHPOUT",
		"LLINEIN", "Line In Jack",
		"RLINEIN", "Line In Jack";

	atmel,ssc-controller = <&ssc0>;
	atmel,audio-codec = <&wm8731>;
};