ARM: ux500: move to multiplatform

Nothing is holding us up any more, and we can make ux500 coexist
with the rest of the platforms. The timex.h and uncompress.h
headers are no longer needed now.

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