Merge "Revert "[hotword] make service exemption configurable via sysprop"" into udc-dev am: 11cd4696 am: bd9ff0b9 am: e8c50f06

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



Change-Id: If01acdf8c41bc5e68dae71ad5a6d052f05ce56d8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>