SystemUI: make clock and time clickable in statusbar

Clicking clock opens alarms, clicking the date will open the calendar.

Change-Id: I622527c1f144a8867aa543348b70a4fefe3f6403
Signed-off-by: Roman Birg <roman@cyngn.com>

Patchset: 1
http://review.cyanogenmod.org/#/c/80029/