codec2: add C2SoftVorbis

Bug: 74770949
Test: setprop debug.stagefright.ccodec true
Test: stagefright -ao -N c2.google.vorbis.decoder /sdcard/clips/bbb_vorbis.ogg

Change-Id: I5ec599bd49debd507d899fbc8b0b0f4165c2ee8f
3 files changed