ARM: LPC32xx: DTS files for device tree conversion

This patch adds the dts files for the reference machine of LPC32xx:

* arch/arm/boot/dts/lpc32xx.dtsi: Include for devices based on LPC32xx
* arch/arm/boot/dts/phy3250.dts: Board support for PHYTEC phyCORE-LPC3250

Signed-off-by: Roland Stigge <stigge@antcom.de>