Merge "hotword: Add background audio signal power property" into udc-dev am: d343117c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22106647



Change-Id: Ic0da3d30c9e3c617b05af32a416eb3e065947028
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>