Merge "Shutdown hotword detection service when software hotword detector is...

Merge "Shutdown hotword detection service when software hotword detector is shutdown" into sc-dev am: 870c4116 am: c8f6614a am: 40bfd87c am: 2399f248

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

Change-Id: I9efe3f5867810d34e3350d18ecb3da900062b50a