ARM: ux500: Reprogram timers upon resume

On ux500 the MTU timer blocks are powered off during
suspend/resume, so these need some reinitialization when
coming back from suspend.

Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>