stm32/moduos: Convert module to use extmod version.

Signed-off-by: Damien George <damien@micropython.org>

extmod/misc.h

@@ -36,6 +36,7 @@ MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(mp_uos_dupterm_obj);
 
 #if MICROPY_PY_OS_DUPTERM
 bool mp_uos_dupterm_is_builtin_stream(mp_const_obj_t stream);
+void mp_uos_dupterm_stream_detached_attached(mp_obj_t stream_detached, mp_obj_t stream_attached);
 uintptr_t mp_uos_dupterm_poll(uintptr_t poll_flags);
 int mp_uos_dupterm_rx_chr(void);
 void mp_uos_dupterm_tx_strn(const char *str, size_t len);