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: 5a55d49f am: 1044236c am: bc00cf9b

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



Change-Id: If1d0df1b065dd830abd446b5bbb0b599d06225e0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>