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: I9b72a46a23e6b0f21687aac65c5a8ce23e3a8421
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>