devlink: drop leftover duplicate/unused code

The recent merge from net left-over some unused code in
leftover.c - nomen omen.

Just drop the unused bits.

Signed-off-by: Paolo Abeni <[e-mail]>
Reviewed-by: Jiri Pirko <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/devlink/leftover.c

···
 	return err;
 }
 
-static void devlink_param_notify(struct devlink *devlink,
-				 unsigned int port_index,
-				 struct devlink_param_item *param_item,
-				 enum devlink_command cmd);
-
-struct devlink_info_req {
-	struct sk_buff *msg;
-	void (*version_cb)(const char *version_name,
-			   enum devlink_info_version_type version_type,
-			   void *version_cb_priv);
-	void *version_cb_priv;
-};
-
 static const struct devlink_param devlink_param_generic[] = {
 	{
 		.id = DEVLINK_PARAM_GENERIC_ID_INT_ERR_RESET,