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: Ib196ad45681ce3563eca2a1d353f45f4f68867d2

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