drm/connector: Remove DRM_COLOR_FORMAT defines
Now that all users of DRM_COLOR_FORMAT_* defines have been converted to
the new enum, we can get rid of those defines.
Acked-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260305-drm-rework-color-formats-v3-13-f3935f6db579@kernel.org
Signed-off-by: Maxime Ripard <mripard@kernel.org>