drm/i915: Remove unused dev_priv->panel_wants_dither

This is now private to the DVO connector, remove it from the main device
private.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/i915_drv.h

@@ -328,7 +328,6 @@ typedef struct drm_i915_private {
 
 	/* LVDS info */
 	int backlight_level;  /* restore backlight to this value */
-	bool panel_wants_dither;
 	struct drm_display_mode *panel_fixed_mode;
 	struct drm_display_mode *lfp_lvds_vbt_mode; /* if any */
 	struct drm_display_mode *sdvo_lvds_vbt_mode; /* if any */

drivers/gpu/drm/i915/intel_lvds.c

@@ -229,7 +229,7 @@ static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
 
 	/* Make sure pre-965s set dither correctly */
 	if (INTEL_INFO(dev)->gen < 4) {
-		if (dev_priv->panel_wants_dither || dev_priv->lvds_dither)
+		if (dev_priv->lvds_dither)
 			pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 	}