stm32/mpconfigport.h: Enable lwIP raw sockets.

ports/stm32/mpconfigport.h

@@ -150,6 +150,7 @@
 #define MICROPY_PY_UTIME_MP_HAL     (1)
 #define MICROPY_PY_OS_DUPTERM       (3)
 #define MICROPY_PY_UOS_DUPTERM_BUILTIN_STREAM (1)
+#define MICROPY_PY_LWIP_SOCK_RAW    (MICROPY_PY_LWIP)
 #define MICROPY_PY_MACHINE          (1)
 #define MICROPY_PY_MACHINE_PULSE    (1)
 #define MICROPY_PY_MACHINE_PIN_MAKE_NEW mp_pin_make_new