disp: msm: update uapi and device_caps change in rotator

Added uapi and device_caps changes to enable rotator
compilation and address video device registration failure.
Device_caps field is must for video device registration
unless it is sub device.

Change-Id: I7e2f517e5eb3fc5ec6306bd7cee5972dbbaff3d1
Signed-off-by: Raviteja Tamatam <travitej@codeaurora.org>