hal: post_proc: add volume based audio calibration support

- add new effect module to listen to volume and device change
- based on volume levels of all streams active over speaker
  compute gain based calibration level and communicate
  with audio HAL to send the same to ACDB loader

Change-Id: I27294dee3b757a3e7999a62f4f538b59d91c2e58
2 files changed