Merge "Add EventFlag for effect HAL thread processing" am: fe4b88ab73 am: b91c54705b am: 9bab6aa527

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2529223

Change-Id: Iae1fb8b92e5336073cf00df4b74c7d4b6a0c516d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>