Merge "[hotword] make service exemption configurable via sysprop" into udc-dev am: 4a30c1d2 am: 6b9ddf35 am: bccf6151 am: c529a6a2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23211877



Change-Id: I91d83369a39f5935ee0653d3065661a7c2ff1f8c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>