ARM: ux500: Stop calling the UIB init function when using Device Tree

As there will be a Device Tree created for the UIBs, there is no
need to call the UIB initiation functions. Each device will be
detailed and registered from the Device Tree instead.

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