Add username to status bar and update layout

Update the status bar with the new UX designs:
- Remove driver and passenger HVAC views
- Add driver icon (placeholder) and username aligned to start of bar
- Move system icons aligned to end of bar (previously next to clock)
- Add AM/PM to clock

HVAC will be moved into the navigation bar in a separate change.

Test: manual - change to guest, change username, change to long username (truncates before clock view)
Test: atest :carsysui-presubmit
Bug: 162598687
Change-Id: I5b9095adce7fee0970e8b15d307f01eb4adf2b40