Try to fix rounded corner overlay issue

Previously, the feature cannot exclude rounded corner layer because
it will be promoted to the top-most layer regardless of its window type.

1. Excludeds the rounded layer for a DisplayArea feature by default
because rounded corner should be anchored to its default position for most
features.
2. Increases the max layer because we may include/exclude
rounded corner layer unexpectedly by including/excluding window layer
TYPE_POINTER.
3. Fix ArrayIndexOutOfBoundsException when include/exclude TYPE_POINTER

Test: atest DisplayAreaPolicyBuilder#testFeatureNotThrowArrayIndexOutOfBoundsException
Test: manual - trigger hide notch + OHM
Bug: 172451212

Change-Id: I31794b665a8237e6dc8643a5a8d0e4f01c663621