hal: add support for external speaker driver library

Change-Id: I599c96793097ab6202412cbd55c8e9165c226eed

Bug:  17319721
5 files changed
tree: ce8f77d204f5a3a59462c4f7dc6b4ae519b53eb0
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk