CCodec: Episode II --- Prepare For Audio

- Get components from C2ComponentStore
- Determine type of the stream from C2ComponentInterface
- Change Codec 2.0 prefix from "codec2." to "c2."
- Define csd info and handle it
- Change codec name override flag for stagefright command-line tool
  from "-O" to "-N"

Test: setprop debug.stagefright.ccodec true
Test: stagefright -S -N c2.google.avc.decoder /data/local/tmp/a.mp4
Change-Id: Id9d60fd086ddcb751e5d8f658ef81bd629c0f4a1