Set default a2dp sbc encoding quality to high

* Increased bitpool to high quality setting (53). * Added rate quality
reduction to medium quality for basic rate connections * Enhanced
a2dp frame calculation ratio to smooth out frame distrubution * Removed
iop scaling patch.

Bug 8252054

Change-Id: I20725d0decfe5f820e1c03407889b6272e830aca
5 files changed