Merge changes I01ad15fa,I428e9f0c,I49ea4d01,I4dcc9f6d,Ibfeb9ae3, ... into sc-dev

* changes:
  audiopolicy: avoid unnecessary closure of HOTWORD recording.
  audiopolicy: Add support for multiple display ports.
  audiopolicy: Wrong device selection for music during concurrency.
  audiopolicy: fix voice volume mismatch after headset removal.
  nuplayer: handle setPlaybackSettings on direct tracks.
  libmedia: modify conditions to reuse track.