Update keyguard and pattern-lock layouts for new UX designs.

To do this, we bring DigitalClock over from Clock into the
internal widgets.  Its font, Clockopia, comes along for the
ride (find it in /system/fonts).

This change is required for relevant code changes in
frameworks/policy/phone.

Change-Id: I354534f1abd9cf9557c9d18566f1d55b6be5e8f1