Bring back the date!

QS shows the date once more. This time it'll be on the top, just next to
the time. Tapping on the date will bring the user to alarms for now
because there is no public AlarmClock action that will bring the user to
the main clock tab in DeskClock

Test: visual
Change-Id: I4d0eb049e98d4bea0f59ef0a7b7da17907c52b67
Fixes: 71357632