modesetting: Add support for the GAMMA_LUT and CTM properties
In drm, the
GAMMA_LUT property provides a larger gamma ramp that can be used to support more precise color ramps, and
CTM (the color tranform matrix) can be used to adjust colors between color channels. The drm core code requires that clients use the
GAMMA_LUT property when setting the
CTM, which is why these two properties are tied together in this series.
This series exposes
GAMMA_LUT through the RandR 1.2 gamma ramp interface, and exposes
CTM via a RandR output property.