audio: hal: add customized external smart pa code
am: 13f26e89c5

Change-Id: I7bada2ae9ee193e050fa0bed0a485c2f666762de
tree: 0c84567ad1d667960e6c5395871cfac2b5afe759
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk