Merge "Add id for keyboard backlight container" into udc-dev am: 1a1cc48d am: fed2847b am: b7dd8ee7

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22907721



Change-Id: I7d27ee7fc94e343d6c68dddf14b07d5a478458da
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>