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: 1a05519d am: 8228fe65

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



Change-Id: Ia9e3bc0bb8bea0fdc263cd141a4c6df56ffbdd12
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>