Merge "Enabled flag for LOG_DND_STATE_EVENTS." into udc-dev am: 11230c84 am: 421418a1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23389999



Change-Id: I9736e8d826e13ededb8267a352251a0f8866844f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>