Effect AIDL: Move EffectThread process into mutex am: b49631f4c2 am: 5cf8828110 am: e43c479b1c

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

Change-Id: I0a0d98a4d33234ee7e9f338d2cd519976e181ea7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>