Add insets for taskbar when a camera cutout interrupts it

Certain devices have camera cutouts that taskbar's insets did not account for previously. This change adds in the cutout's height as a bottom inset (if it is present) to avoid a black bar being drawn in the taskbar area.

Fix: 322954760
Test: Open a full screen app on a large screen device and ensure that a black bar doesn't show up when rotating the screen to 90 degrees and 180 degrees.
Flag: N/A
Change-Id: I876274b561c7f0101554654ce758fc9c08180de7