Sync with linux-omap tree. Fixes for clock framework,
DSP related updates, and optional polling read and write.

DSP updates by Toshihiro Kobayashi <toshihiro.kobayashi@nokia.com>
Polling read and write by Nishant Menon <x0nishan@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>