ARM: ks8695: merge the timer header into the timer driver

This <mach/regs-timer.h> is broadcasted in the entire kernel for
no good reason, since it's only used by the timer driver. Merge
it into the driver.

Tested-by: Greg Ungerer <gerg@snapgear.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>