Merge "[hotword] make service exemption configurable via sysprop" into udc-dev...

Merge "[hotword] make service exemption configurable via sysprop" into udc-dev am: 4a30c1d2 am: 6b9ddf35 am: 531a6034

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



Change-Id: I603a3bd1b6bc81208c90b19d519b10f998973f67
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>