hal: Add support for HFP feature

- add support for audio tuning of HFP
- add TX reference for TX Echo Cancellation

Change-Id: I5d7ffe1481a5093262b4b94ae0325fa81111feac
Signed-off-by: Uday Kishore Pasupuleti <upasupul@codeaurora.org>
4 files changed
tree: 5f442f9d6d6b90a473cc3dfa505790ef2254c5fa
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk