libstagefright: 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: Id4d090bc6cf90782c24f3832a35ddeca43bd72fc
Revert "allow loading a2dp hal for bluez"

This reverts commit a53589e8b11abe4766c9d16c26470519fdb5ca69.
Revert "msm7x27a: only submit one input buffer"

This reverts commit 84296475a050e4775c01e9927fc4ad3c4f011150.
libstagefright: Enable meta mode for 7x27a video encoder

msm7627a family of chipsets supports only one input frame at
one time. camera expects the input frame to be released before
sending another frame. so send one input buffer and available
output bufefrs to video encoder component. Release the input
buffer to camera (to get another frame) after receiving input
frame done callback from video encoder component.

Change-Id: I8fbc911f046ff7e2a3047dd65d8c09ac2d8608e1
Merge remote-tracking branch 'CyanogenMod/cm-10.1' into cm-10.1