Stagefright: Fix playback for mkv files with lacing

Most mkv files having 'lacing' in their audio section to save space.
Android did not handle this properly, sending all frames in the block
with the same time code, which causes stuttery playback.

Change-Id: I4dc76e7c2a53126c7fbdd3628fe7d339d2e3364e
Libstagefright: Fix crash while setting buffer size

The format returned from MakeAVCCodecSpecificData may be
NULL and will crash on trying to set buffer size.

Added NULL check to avoid crash

Conflicts:
	media/libstagefright/mpeg2ts/ESQueue.cpp

Change-Id: I45485f820a6aa657e63aeeb6dd43061a2e3575e3