clocksource: Add Owl timer

The Actions Semi S500 SoC provides four timers, 2Hz0/1 and 32-bit TIMER0/1.

Use TIMER0 as clocksource and TIMER1 as clockevents.

Based on LeMaker linux-actions tree.

An S500 datasheet can be found on the LeMaker Guitar pages:
http://www.lemaker.org/product-guitar-download-29.html



Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Andreas Färber <afaerber@suse.de>