drm/i915: Set csc coefficients in update_pipe_size.

This might not have been set during boot, and when we preserve
the initial mode this can result in a black screen.

Cc: Daniel Stone <daniels@collabora.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -3274,6 +3274,9 @@ static void intel_update_pipe_size(struct intel_crtc *crtc)
 	if (!i915.fastboot)
 		return;
 
+	if (HAS_DDI(dev))
+		intel_set_pipe_csc(&crtc->base);
+
 	/*
 	 * Update pipe size and adjust fitter if needed: the reason for this is
 	 * that in compute_mode_changes we check the native mode (not the pfit