drm/edid: reset display info in drm_add_edid_modes() for NULL edid

If a NULL edid gets passed to drm_add_edid_modes(), we should probably
also reset the display info.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/2ac1c55f94a08d5e72c0b518d956a11002ec85c1.1651569697.git.jani.nikula@intel.com

drivers/gpu/drm/drm_edid.c

@@ -5697,6 +5697,7 @@ static int drm_edid_connector_update(struct drm_connector *connector,
 	u32 quirks;
 
 	if (edid == NULL) {
+		drm_reset_display_info(connector);
 		clear_eld(connector);
 		return 0;
 	}