Hide icons in QS Header if there's a cutout

If there's a cutout, put a blocking view in the space of the cutout.
Also, make the views on each side to be 0dp, weight 1. That way, the
view remains centered.

Fixes: 187145236
Test: manual
Change-Id: Ide54995afba92fbc559fdbe4c77bf5ca495b7b57