Merge "Revert "[hotword] make service exemption configurable via sysprop""...

Merge "Revert "[hotword] make service exemption configurable via sysprop"" into udc-dev am: 11cd4696

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23245838



Change-Id: I5bcf04a5bf3634952a2f05d37883a3d87b981c64
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>