Merge "aaudio: factor the format converstion function" into sc-dev am:...

Merge "aaudio: factor the format converstion function" into sc-dev am: 279dbc40 am: 1a3d689f am: 41704e9d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/14310034

Change-Id: I73978844eaf27a6a5421317cc1e131c432469e12