Realtek Watchdog Timer Controller

Required properties:
- compatible: "realtek,rts3903-wd"
- reg: Address range of the WDT registers

Example:

	watchdog: watchdog@0x18862000 {
		compatible = "realtek,rts3903-wd";
		reg = <0x18862000 0x10000>;
		status = "disabled";
	};
