Revert "mediaplayer: keep more buffers with the BufferQueue"

This reverts commit b635b0e66b257ab442e230bca96afd5105cf6829.

Conflicts:
	media/libstagefright/ACodec.cpp
	media/libstagefright/OMXCodec.cpp

Conflicts:
	media/libstagefright/ACodec.cpp