drm/i915/bios: pass devdata to parse_ddi_port

Allow accessing the parent structure later on. Drop const for allowing
future modification as well.

Cc: Vandita Kulkarni <vandita.kulkarni@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/3318b09aaccbbe141e233ca510d581b421259a2a.1575974743.git.jani.nikula@intel.com

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

@@ -1554,9 +1554,10 @@ static enum port dvo_port_to_port(u8 dvo_port)
 }
 
 static void parse_ddi_port(struct drm_i915_private *dev_priv,
-			   const struct child_device_config *child,
+			   struct display_device_data *devdata,
 			   u8 bdb_version)
 {
+	const struct child_device_config *child = &devdata->child;
 	struct ddi_vbt_port_info *info;
 	bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
 	enum port port;
@@ -1708,7 +1709,7 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv,
 
 static void parse_ddi_ports(struct drm_i915_private *dev_priv, u8 bdb_version)
 {
-	const struct display_device_data *devdata;
+	struct display_device_data *devdata;
 
 	if (!HAS_DDI(dev_priv) && !IS_CHERRYVIEW(dev_priv))
 		return;
@@ -1717,7 +1718,7 @@ static void parse_ddi_ports(struct drm_i915_private *dev_priv, u8 bdb_version)
 		return;
 
 	list_for_each_entry(devdata, &dev_priv->vbt.display_devices, node)
-		parse_ddi_port(dev_priv, &devdata->child, bdb_version);
+		parse_ddi_port(dev_priv, devdata, bdb_version);
 }
 
 static void