stingray: libaudio: Additional ECNS logging capabilities

 - Added "Black Box" logging capability for EC/NS input/output
 - Added separate PCM stream logging within the EC/NS component
 - Throw away playback data at the beginning of VOIP call to
   avoid excessive kernel buffering
 - Tweak buffer config threshold for capture

Change-Id: I8761be9d39872a43f1fd33d325c19e2fb4f019ab
Signed-off-by: Iliyan Malchev <malchev@google.com>
3 files changed