BluetoothAudio: Refine the FMQ size for A2DP software encoding am: a0cc24730e am: 96f6682952 am: e07d015249 am: cc7c2043ba

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

Change-Id: Ibe4d2baf99a846527a7a8216cdf18be7356d3c22