Simple Amplifier Audio Driver

Required properties:
- compatible : "dioo,dio2125" or "simple-audio-amplifier"

Optional properties:
- enable-gpios : the gpio connected to the enable pin of the simple amplifier
- VCC-supply   : power supply for the device, as covered
                 in Documentation/devicetree/bindings/regulator/regulator.txt

Example:

amp: analog-amplifier {
	compatible = "simple-audio-amplifier";
	VCC-supply = <&regulator>;
	enable-gpios = <&gpio GPIOH_3 0>;
};