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On some devices we don't have a per-CRTC color transform matrix,
but we do have a per-plane CTM that is currently not used.

This CL emulates a per-crtc CTM on those devices.

Bug: 749250
Test: Night light on RK3399
Change-Id: Id5135e00e72085b7890426dca7688d34cf6759f7
Reviewed-on: https://chromium-review.googlesource.com/1037403
Commit-Queue: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555571}