Zodiac RAVE Watchdog Timer

Required properties:
- compatible: must be "zii,rave-wdt"
- reg: i2c slave address of device, usually 0x38

Optional Properties:
- timeout-sec: Watchdog timeout value in seconds.
- reset-duration-ms: Duration of the pulse generated when the watchdog times
  out. Value in milliseconds.

Example:

	watchdog@38 {
		compatible = "zii,rave-wdt";
		reg = <0x38>;
		timeout-sec = <30>;
		reset-duration-ms = <30>;
	};