arm-soc: timer updates

This contains two branches dealing with timers, one for the picoxcell
platform that is now using DT with the platform-independent
dw_apb_timer driver. The other change is for the omap-specific
dmtimer driver.
Merge branch 'picoxcell/timer' into next/timer

Imported from mailing list

* picoxcell/timer:
  clocksource: dw_apb_timer: Add common DTS glue for dw_apb_timer

Signed-off-by: Arnd Bergmann <arnd@arndb.de>