Merge "[hotword] make service exemption configurable via sysprop" into udc-dev...

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

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



Change-Id: I7ee899237ab5a96331544116723a18f9e190e96c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>