Xiaomi for some reason uses mainBuiltInDisplayCutoutRectApproximation
as mainBuiltInDisplayCutout. Let's create a new mainBuiltInDisplayCutout,
make it a circle and fill it to avoid aliasing in the cutout area.
Change-Id: I9b822cdb79f72daaa0a334bfbee98ad255dfd04d
Signed-off-by: Jens Reidel <adrian@travitia.xyz>