CCodec: Episode I --- Barely Decoding Video

- Implement CCodec and CCodecBufferChannel: video decoder only
- Modify stagefright command line tool to take component name
- Fix C2SoftAvcDec around EOS and flush

Bug: 69376489
Test: setprop debug.stagefright.ccodec true
Test: stagefright -S -O codec2.google.avc_decoder /data/local/tmp/a.mp4
Change-Id: I36d5f476099b5c055c0be0244e99bdf9dd28441e