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

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



Change-Id: Ibefdb29175936aced5b76263bec4795c5f568dc1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>