Remove corner cutout tracking from HeadsUpStatusBarView

It seems that once corner cutout tracking was brought to the entire
content view of status_bar, HeadsUpStatusBarView started potentially
double counting left-side corner cutout views and no longer needs it

There is still an issue here that we don't get a layout pass quick
enough if a HUN happens right after a rotation. But this brings us back
to an eventually-stable layout

Test: manual; trigger a heads up notification after rotation on a device
with a display cutout
Fixes: 185679234

Change-Id: I2930d95f817c42df68aafd45e143f87bd03f7e71