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This will revert back to software mirroring, since hardware mirroring
won't work and will result in a black screen.

BUG=b/35583078

Change-Id: Id8496c5966554f5fa866812cd87fc87e3ddd4a92
Reviewed-on: https://chromium-review.googlesource.com/575669Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488779}