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: I3a973d3ab5ba10563a1f6c69245774a42f49a28b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>