Merge "Shutdown hotword detection service when software hotword detector is shutdown" into sc-dev am: 870c4116c1 am: aa0b719c40

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15461817

Change-Id: I2d5ee271b6f24884baaf0db774a598340d787b38