WM8782 stereo ADC

This device does not have any control interface or reset pins.

Required properties:

 - compatible  : "wlf,wm8782"
 - Vdda-supply : phandle to a regulator for the analog power supply (2.7V - 5.5V)
 - Vdd-supply  : phandle to a regulator for the digital power supply (2.7V - 3.6V)

Optional properties:

 - wlf,fsampen:
   FSAMPEN pin value, 0 for low, 1 for high, 2 for disconnected.
   Defaults to 0 if left unspecified.

Example:

wm8782: stereo-adc {
	compatible = "wlf,wm8782";
	Vdda-supply = <&vdda_supply>;
	Vdd-supply = <&vdd_supply>;
	wlf,fsampen = <2>; /* 192KHz */
};