audio hal: add support for USB_HEADSET device
am: 99dab497f8

Change-Id: I7500f6cece55442f62cfaf87554939207b10fed5
tree: 735e6866df1be7b6faee476f866ea9a7aec0c9d2
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk