Fix in java MP3 decoder.

git-svn-id: http://jpcsp.googlecode.com/svn/trunk@3617 4ab978e6-3352-0410-996c-0b42db0051c8
Implemented sceMp3LowLevelDecode and sceMp3LowLevelInit using the Java MP3 decoder.

git-svn-id: http://jpcsp.googlecode.com/svn/trunk@3618 4ab978e6-3352-0410-996c-0b42db0051c8
Cleanup sceAtracLowLevelDecode: the new Java decoder is now handling all the cases, MediaEngine (Xuggler) is no longer needed.

git-svn-id: http://jpcsp.googlecode.com/svn/trunk@3619 4ab978e6-3352-0410-996c-0b42db0051c8