backends/drm: support CTM for simple color transformations
In order to work around hardware and drivers that aren't capable of applying a LUT, calculate a per-channel factor for brightness and color temperature modification. While this ignores color calibration, this makes night color work until a proper shader based color pipeline is implemented. BUG: 455720
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mentioned in commit 970c61d0
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mentioned in merge request !3771 (merged)
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mentioned in commit 114032d2
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