alsa_sound: Add support for custom LPA buffer size

 * On msm8930, during playback over A2DP with DSP Manager effects enabled,
   there's a lot of stuttering with the default buffer size. Stock kernel
   used a buffer size of 32, but that caused no audio at all in CM because
   of mismatch in buffer size between kernel and user space. So up until
   now I've been using a buffer size of 256 to get audio working at all,
   but unfortunately it causes stuttering as mentioned. Hence add support
   for a custom buffer size so we can revert to stock value used in kernel,
   and enjoy no stuttering.

Change-Id: I29113cee46d0adcc72a8c9c830e4c15d9fdd43dc
msm7x30: disable logcat spam

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: I82ebb39e62f49c24f236cc9eeadbc303f8dbd823
Merge "msm7x30: disable logcat spam" into cm-10.1
alsa_sound: Fix audio over Miracast

 * We're not using QC's proprietary WFD solution, so pick the remote
   submix instead of the proxy.

Change-Id: Ie32a4591a27f17e2a1d0b87b5f5a7b8b320ff169