Libstagefright: Add MPEG2 Codec support

Enables playback support for MPEG2 Codec to play specific ts content

Conflicts:
	media/libstagefright/ExtendedCodec.cpp

Change-Id: I96e44b1f1f26ea138802d8d75f1784a06dd8dc6b
Merge "Libstagefright: Add MPEG2 Codec support" into du44