Allow mobile status bar icon to overflow

With display size set to larest, a wide notch emulated, and battery
percentage showing, it's possible to not be able to fit a single status
icon other than the battery. In this case, the mobile icon needs to
overflow into the etc area.

Some other changes:
- set View.INVISIBLE instead of View.GONE when hiding the mobile view so
that it correctly reports its width on measure
- Don't subtract padding from width when laying out StatusIconContainer

Test: visual
Change-Id: Ic8e73402a3371331dd4c803f3c4559da276ba0a2
Fixes: 78149953
Fixes: 77504032