ARM: gemini: Setup timer3 as free running timer

In the original driver it is missed to setup a free running driver.
This timer is needed for the scheduler.
So setup it.

Signed-off-by: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>