audio: hal: set mode bt in tfa when entering start_hfp
am: 0b67950f89

Change-Id: Ia55b5e06b92caeff56ea3e199a243ea359f82452
tree: f7cc46d6ff0668dcc645bd02d9ff3b142f6f9e7e
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk