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AFBC for modeset buffers doesn't work correctly, as we can't fill them
with valid AFBC contents. For now, don't use AFBC for modeset buffers.
Remove this after we make ozone/drm capable of creating valid AFBC
modeset buffers (tracked by crbug.com/852675).

Bug: 852675, 853328, b/109782243
Test: External monitor works on Kevin

Change-Id: I902f2615aa78e34251381f87e25c5e76f39b94b5
Reviewed-on: https://chromium-review.googlesource.com/1100666
Commit-Queue: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568024}