4.2 Transition: Notification Header datetime click

- Fixes tiny clickable area for much smaller 4.2 date string
- remaps clock behavior:
  - click does open deskclock now - same as clicking clock widgets now does
  - long click jumps directly to alarm setup

Change-Id: Ic4e3f623ef7b6bf4116242b479c681f2866b4c9c

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/policy/DateView.java