Add new system level permission EMERGENCY_INSTALL_PACAKGES

The new permission will allow each app store in the system image to designate another app in the system image which has permission from the framework to update the app store.

For more info: go/android-firebrick-1pager

Test: m
Bug: 321080601
Change-Id: Ib3f28acde506fe87ff9c7a1567d125f1e10793d8
3 files changed