Maxim Integrated DS4422/DS4424 7-bit Sink/Source Current DAC Device Driver

Datasheet publicly available at:
https://datasheets.maximintegrated.com/en/ds/DS4422-DS4424.pdf

Required properties:
	- compatible: Should be one of
		maxim,ds4422
		maxim,ds4424
	- reg: Should contain the DAC I2C address

Optional properties:
	- vcc-supply: Power supply is optional. If not defined, driver will ignore it.

Example:
	ds4224@10 {
		compatible = "maxim,ds4424";
		reg = <0x10>; /* When A0, A1 pins are ground */
		vcc-supply = <&vcc_3v3>;
	};
