drm/i915/color: Convert color management code to intel_display

struct intel_display will replace struct drm_i915_private as
the main thing for display code. Convert the color management
code to use it (as much as possible at this stage).

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241024165356.17756-4-ville.syrjala@linux.intel.com


Reviewed-by: Jani Nikula <jani.nikula@intel.com>