add more config to audio volume depending on H/W

- some H/W can support volume in audio context level.
- some H/W can support volume per each physical streams only
- some H/W may have permanent storage for volume. In that
  case, that volume should be used as a master volume in android
  side.

bug: 27744968
Change-Id: Id0ac529d57d148f1df718fa7726df2b2bf170553
(cherry picked from commit ad82bb0508889638b73c0ce80717e8a0ebb05cff)
1 file changed