Merge "Prevent system restart while updating package during boot" into udc-dev...

Merge "Prevent system restart while updating package during boot" into udc-dev am: f8e289c6 am: 65e6378f am: 2a1c02e3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22983796



Change-Id: I71b5191b40e46efdd7ae7e3dfe7c6d5ed8897333
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>