* NXP LPC32xx SoC Real Time Clock controller

Required properties:
- compatible: must be "nxp,lpc3220-rtc"
- reg: physical base address of the controller and length of memory mapped
  region.
- interrupts: The RTC interrupt

Example:

	rtc@40024000 {
		compatible = "nxp,lpc3220-rtc";
		reg = <0x40024000 0x1000>;
		interrupts = <52 0>;
	};
