cleanup media_codecs.xml
change from OMX.ffmpeg.vheuristic.decoder to OMX.ffmpeg.vtrial.decoder and
change from OMX.ffmpeg.aheuristic.decoder to OMX.ffmpeg.atrial.decoder
add support for vorbis codec
fix vorbis seek error
vorbis test files:
http://www.vorbis.com/music/
http://www.vorbis.com/music/Epoq-Lepidoptera.ogg
http://www.vorbis.com/music/Hydrate-Kenny_Beltrey.ogg
http://www.vorbis.com/music/Lumme-Badloop.ogg
http://www.vorbis.com/music/Mists_of_Time-4T.ogg
http://www.vorbis.com/music/The_Abyss-4T.ogg
cleanup SoftFFmpegAudio and SoftFFmpegVideo decoders
ffmpeg vorbis decoder can not work now, disable it