Ralink Watchdog Timers

Required properties:
- compatible: must be "ralink,rt2880-wdt"
- reg: physical base address of the controller and length of the register range

Optional properties:
- interrupts: Specify the INTC interrupt number

Example:

	watchdog@120 {
		compatible = "ralink,rt2880-wdt";
		reg = <0x120 0x10>;

		interrupt-parent = <&intc>;
		interrupts = <1>;
	};