Redesigned keyguard layout in the no-SIM case. DO NOT MERGE

The emergency call button has been removed (since the user
can disable the keyguard, open the phone app, and enter the
emergency number there).

AM/PM have also been baseline-aligned with the clock.

Bug: 2421380
Change-Id: I3fb25a29e02f3e2ee2b1505a8765d53ccceb1372