[automerger skipped] Merge "BufferPool: limit number of idle buffers in...

[automerger skipped] Merge "BufferPool: limit number of idle buffers in caches" into mainline-prod am: 426b0f5a -s ours

am skip reason: Change-Id If3f4433ba1794ccb624b864a56619c8613a315f2 with SHA-1 d620a390 is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/13194463

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I1a04be353d0150b4589b1c45858587419f3f63b5