Add OMX_AUDIO_CodingAPE and OMX_AUDIO_CodingDTS

Copied from the stagefright-plugins project.

add HEVC decoder and cleanup

Change-Id: I16342228014320161a22302a3c14df7725556cd2
Merge commit '84099f71d2e273c4498c5d537252f23cba9b7a3f' into slimkat