Merge "libaudiohal: mmap playback support" am: 88e189e8b3 am: ed2e7d7f6d am: ef4e1fd2b7

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2514035

Change-Id: I2d2e63bdb56fc826bb4a94947bde2a977becfa9a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>