Merge "Log plug state chage & other events at boot" into udc-dev am: 9ada0c5a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23854042



Change-Id: Ic7b46458d5e2539f43326ce016241484464c6d76
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>