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

Merge "Revert "[hotword] make service exemption configurable via sysprop"" into udc-dev am: 11cd4696 am: 36cb23ae am: a57d3b3f

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



Change-Id: I4ea8430cda23ca45aec17db58b42808f09b13ca0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>