drm/i915/sdvo: Don't add DDC modes for LVDS

Stop enumerating the DDC modes for SDVO LVDS outputs (outside
the initial fixed mode setup). intel_panel_mode_valid() will
just reject most of them anyway, and any left over are entirely
pointless as they'll match the fixed mode hdisp+vdisp+vrefresh
so no user visible effect from using them instead of the fixed
mode.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221026101134.20865-6-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/intel_sdvo.c

@@ -2299,17 +2299,12 @@ static int intel_sdvo_get_tv_modes(struct drm_connector *connector)
 
 static int intel_sdvo_get_lvds_modes(struct drm_connector *connector)
 {
-	struct intel_sdvo *intel_sdvo = intel_attached_sdvo(to_intel_connector(connector));
 	struct drm_i915_private *dev_priv = to_i915(connector->dev);
-	int num_modes = 0;
 
 	drm_dbg_kms(&dev_priv->drm, "[CONNECTOR:%d:%s]\n",
 		    connector->base.id, connector->name);
 
-	num_modes += intel_panel_get_modes(to_intel_connector(connector));
-	num_modes += intel_ddc_get_modes(connector, &intel_sdvo->ddc);
-
-	return num_modes;
+	return intel_panel_get_modes(to_intel_connector(connector));
 }
 
 static int intel_sdvo_get_modes(struct drm_connector *connector)