Effect AIDL: Move EffectThread process into mutex am: b49631f4c2 am: 5cf8828110

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2419710

Change-Id: I753a7efe8b4b365735964c247e910754bbf6acb9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>