[Statusbar] requestLayout when datatype vis changes

Testing manually, we are missing some layout passes when the visibility
fo the data type icon changes. Manually causing a relayout by e.g.
expanding / collapsing the QS shade fixes it, so we are clearly not
getting a chance to relayout the mobile view (unknown root cause).

Test: toggle airplane mode with a SIM that has mobile data. Note that
when the data type icon shows it is laid out properly (no overlap).
Fixes: 307844609
Flag: NONE

Change-Id: I97e5466840ebd6c3053aa747315bab22fdf3538a