Merge "hotword: Background audio signal power unit" into udc-dev am: 1b485a66

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22205642



Change-Id: I297e60cf32c850f447dac39a6e98fc7043b0510f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>