Realtek Real Time Clock

Required properties:
- compatible: "realtek,rts3903-rtc"
- reg: Address range of the RTC registers
- interrupt: Should contain the RTC interrupt number
- interrupt-parent: Should be the phandle for the interrupt controller
  that services interrupts for this device

Example:

	rtc: rtc@0x18850000 {
		compatible = "realtek,rts3903-rtc";
		reg = <0x18850000 0x1000>;
		interrupts = <RTC_ALARM0_INT_IRQ>;
		interrupt-parent = <&cpuintc>;
		status = "disabled";
	};
