increase read buffer size
fixes compatibility issues with ti-hci driver
Revert "increase read buffer size"

This reverts commit ef1e0e657ed00213497e35ed6a72913404038727.
Revert "a2dp: Set the default A2DP bitrate to high quality"

This reverts commit ce6c2405a9272656285019754fd4d4ac223b92bd.