cc3200/modusocket: Remove deprecated socket.error.

socket.error is deprecated even in upstream:
https://docs.python.org/3/library/socket.html#socket.error,
and never was a part of MicroPython socket API.

cc3200/mods/modusocket.c

@@ -522,7 +522,6 @@ STATIC const mp_map_elem_t mp_module_usocket_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_getaddrinfo),     (mp_obj_t)&mod_usocket_getaddrinfo_obj },
 
     // class exceptions
-    { MP_OBJ_NEW_QSTR(MP_QSTR_error),           (mp_obj_t)&mp_type_OSError },
     { MP_OBJ_NEW_QSTR(MP_QSTR_timeout),         (mp_obj_t)&mp_type_TimeoutError },
 
     // class constants