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

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ief26f8e46deb909c132bc5c4053dab6e630eaf9e