audio: Align HAL buffer size logic with the framework

When the framework uses mixers, it rounds up the buffer
size to the frame count which is a multiple of 16.
In the HIDL implementation, this adjustment was done after
the framework thread was already created, and FMQ was
created on the first transfer, using adjusted size. In
the AIDL implementation, the FMQ is created together with
the stream, using the size suggested by the HAL.

Bug: 321233946
Test: verify audio playback over S/W A2DP
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:f2f9ae08c2ee4e396bbe4b8c7e955bad725ce545)
Merged-In: I35a5479bfc87a290aff09d51415381948857a146
Change-Id: I35a5479bfc87a290aff09d51415381948857a146