Add systemOnly attribute for role.

Roles such as the emergency role requires a system app, so add an
attribute for it. Also made the emergency role system-only.

Bug: 110557011
Bug: 123293861
Test: manual
Change-Id: I4d4951b363317b01a11e646808f2f0cd695b9644
3 files changed
tree: 843cdaade8071b4dc26b1568354a328e1d4fef9a
  1. PermissionController/