Revert "libstagefright: Do not offload HEVC AV decoding"

This reverts commit 1eec4467fb12ee1ae88aa9c1374c79fbf4d03e68.

Conflicts:
	media/libstagefright/AwesomePlayer.cpp
Revert "libstagefright: Add support for PCM in offload path"

This reverts commit b3f9ff4e1579c3263687de33d532ab2dc3fbab0f.

Conflicts:
	media/libstagefright/AwesomePlayer.cpp