Large clock positioning

- Better position the large clock to support various display
sizes. Specs call for centering minus a slight adjustment vertically.
- Make sure notifications don't run into the indication area. The
prior padding was too small.
- Ensure a smooth transition between lockscreen and bouncer
- Fix the smartspace with large clock to not interfere with the dock
settings icon

Fixes: 190047134
Test: manual (all display sizes)
Change-Id: I89e35eef35dc1d3d609b381f768779226962585f