Update to latest UX margins for clock... and much more

Remove old style clocks and all related code. Begin unraveling code
supporting multiple layouts. Migrate plugin small/big clock support to
the new clock areas.

Fixes: 184073275
Test: atest KeyguardClockSwitchTest KeyguardClockSwitchControllerTest
Change-Id: I38dc2a6df6a710c6da23cbb17fac8d28f3b84764
16 files changed