Merge "Fix the issue of null previous brightness reason in the logs" into udc-dev am: 9cbb43e7

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21552447



Change-Id: I4ce6cb71c12bad63e729ad81472bb3ba2a496ac5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>