mp4a box contains mp3 audio when the object type indication is 0x6b

In this case, the MediaExtractor returns ERROR_UNSUPPORTED since our
software MP3 audio decoder may not be able to handle packetized
MP3 audio.

bug - 3377570

Change-Id: I8bb6b3813716b5fa019e318842e8e1908b3c8bf8
1 file changed