Merge "Move media related hidden API flag file entries to frameworks/av" into sc-dev am: d8c8547954 am: d7b1bb8f8b am: 2c97df99b5

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15132971

Change-Id: I5feae6088144eeb49d41366f36973ff5361459db