BluetoothAudio: Refine the FMQ size for A2DP software encoding am: a0cc24730e am: 96f6682952

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1782007

Change-Id: Ia0e0830cdfbf5ddaf75cf787baf2c6ecb2bf09ab