Merge "mediaserver: add more hwbinder threads" into rvc-dev am: 2038329c am: 4bc9b54a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/12046706

Change-Id: I10af92d4e5c1a231f8c56a85838b5f5b3518f712