ARM: ux500: Create a new Device Tree include file for boards supporting STUIBs

This is a skeleton creation which will be populated with the devices
found on one of ST-Ericsson's (UIB) User Interface Board.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>