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: I018fee320275d333ee98fd3bed8071190eb94caa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>