mm-video: vdec: Allow devices to disable adaptive playback

* Older Adreno drivers have problems with adaptive playback due to
  incompatibility inside the library.
* Allow devices to choose to not advertise adaptive playback capability
  if bad output results.

Change-Id: Ie68fb9f8ec2122f2fc6e6654d9fdbc773dff509a
We still use legacy ION

Conflicts:
	mm-video/vidc/vdec/src/omx_vdec.cpp
	mm-video/vidc/venc/src/omx_video_base.cpp
	mm-video/vidc/venc/src/video_encoder_device.cpp