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This CL updates the display configurator API and tests to reflect
unified modeset testing.

Bug: b:176819129
Test: display_unittests && ozone_unittests
Change-Id: Ib87bd884457320b0fafd764d818bb3b2b56d7364
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2613152
Commit-Queue: Gil Dekel <gildekel@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841578}