Freescale Localbus UPM programmed to work with NAND flash

Required properties:
- compatible : "fsl,upm-nand".
- reg : should specify localbus chip select and size used for the chip.
- fsl,upm-addr-offset : UPM pattern offset for the address latch.
- fsl,upm-cmd-offset : UPM pattern offset for the command latch.
- gpios : may specify optional GPIO connected to the Ready-Not-Busy pin.

Example:

upm@1,0 {
	compatible = "fsl,upm-nand";
	reg = <1 0 1>;
	fsl,upm-addr-offset = <16>;
	fsl,upm-cmd-offset = <8>;
	gpios = <&qe_pio_e 18 0>;

	flash {
		#address-cells = <1>;
		#size-cells = <1>;
		compatible = "...";

		partition@0 {
			...
		};
	};
};