Merge "Add EventFlag for effect HAL thread processing" am: d78c656eed am: 2fb4dc8dab

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2525814

Change-Id: Ide8e2491da3bdc8563933e9fa0380b479644b063
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>