TI Real Time Clock

Required properties:
- compatible: "ti,da830-rtc"
- reg: Address range of rtc register set
- interrupts: rtc timer, alarm interrupts in order
- interrupt-parent: phandle for the interrupt controller

Example:

rtc@1c23000 {
	compatible = "ti,da830-rtc";
	reg = <0x23000 0x1000>;
	interrupts = <19
		      19>;
	interrupt-parent = <&intc>;
};
