Latency optimization in bufferCount / MW (Audio android framework).

BufferCount for AudioSink/AudioTrack is changed to 2 from 4. This
is done to improve the latency for the audio buffer.

Change-Id: I25efc9ee6e9ed19daa727f78df2a1dfa1aeddb38
Author: Gurudatta Bhakte <gurudattax.bhakte@intel.com>
Signed-off-by: Gurudatta Bhakte <gurudattax.bhakte@intel.com>
Signed-off-by: Shuo Gao <shuo.gao@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 26849