connman: Support struct ifinfomsg in rtnl handle

[connman] Support struct ifinfomsg in rtnl handle. JB#62287

Add the struct ifinfomsg into the union for the struct
__connman_inet_rtnl_handle. This allows RTM_{NEW,GET,DEL}LINK cmds to be
used as well.

connman/src/connman.h

@@ -225,6 +225,9 @@ struct __connman_inet_rtnl_handle {
 			struct {
 				struct ifaddrmsg ifa;
 			} i;
+			struct {
+				struct ifinfomsg ifi;
+			} f;
 		} u;
 		char buf[1024];
 	} req;