audio: improve logging.

- log msgs showing device switches
- log msgs shoing open/close of input/output streams

Change-Id: Ic6fbedc4b48db72bf2cf8af38ade0e3e80243640
audio: Increased mute wait for USB Playback

- Sometimes, when touch tones are played over USB Headset
  glitch is heard. This issue is seen when startOuput
  is called for touch tone after the device goes into
  standby

- Fix is to increase the mute wait during starting of the
  output to give additional time for the proxy device to
  come up

CRs-Fixed: 615405

Change-Id: I37b772582058ec6939ca13067a31360a4de9784b
Audio: Add new format and property for PCM offload

- Add string to enum method for PCM offload 16/24 bit
  formats

Change-Id: I8dcc2e35e1c8635a5b8f6f8de15167a40b842767
audio: New audio format for FLAC

- Add string to enum conversion for new audio format
  FLAC

Change-Id: Ie49170947a6524aa7412855106d666b467104a93
audio: Handle sonification for last stream in stopOutput

-Low visibility stream is not muted during voice call when
played back to back.
-In startOutput, handleInCallSonification is called only for
first time i.e. mRefCount is 1. While in stopOutput, it is
called without any check on refCount.
This causes second notification stream to be played when
stopOutput of first stream unmutes the muted stream.
-Handle sonification while in call only for last stream in
stopOutput i.e. only if mRefCount is 1.

CRs-Fixed: 663101
Change-Id: If6cbf24aa814a115c98358883794a7c92aec0c86
audio_policy: Fix for audio routing speaker though BT is connected

- Speaker device is selected by getDeviceForStrategy() though BT is
  connected as mA2dpSuspended is still remaining as 'true' even
  after ending the voice call.
- This flasg is not updated by checkA2dpSuspend() as force usage
  for communication and record is still FORCE_BT_SCO after ending
  voice call.
- Modified condition check to set mA2dpSuspended to 'false' as soon
  as phone state is changed to MODE_NORMAL
  porting from change:Ib3a67268be33a10c6bcdf6437868990a92a06c2f

Change-Id: I86ebb66cd165e8009bfa6193d2ad9ab383996283
CRs-Fixed: 671810