Using this, we split overlays based on their category, so that
cutout emulation and theme overlays no longer clash in their
respective settings.
Bug: 72436677
Test: make ROBOTEST_FILTER=EmulateDisplayCutoutPreferenceControllerTest RunSettingsRoboTests
Change-Id: I23f22113351b3948beb9e3a1fb969700852539cc
Instead of a single emulation option, users can select from a list
of different styles of cutouts.
Bug: 65689439
Test: atest EmulateDisplayCutoutPreferenceControllerTest
Change-Id: I75598254849c11d9973f2b9cfdbec117bc3957da