Merge "Gracefully stop the GeneratorHub worker thread in destructor" into rvc-qpr-dev am: a216f7fade am: d8c5052cd1 am: d7886ba5e2

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/13807297

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: If78cb71e128bb462f9fb42a778e4ad3071d13983