ARM: ux500: get rid of static maps

The static mappings of the GPIO blocks, clock/reset controller
and MTU timer are clearly superfluous. These are all probed
exclusively from the device tree. Tested on the U8500.

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