drm/i915: add pipe_config->limited_color_range

Now that we have a useful struct for this, let's use it. Some neat
pointer-chasing required, but it's all there already.

v2: Rebased on top of the added Haswell limited color range support.

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 65550e4..80ac7d7 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -739,7 +739,7 @@
 	}
 
 	if (intel_dp->color_range)
-		adjusted_mode->private_flags |= INTEL_MODE_LIMITED_COLOR_RANGE;
+		pipe_config->limited_color_range = true;
 
 	mode_rate = intel_dp_link_required(adjusted_mode->clock, bpp);