cc3200/mods/pybspi: Remove SPI.MASTER constant, it's no longer needed.

cc3200/mods/pybspi.c

@@ -373,7 +373,6 @@ STATIC const mp_map_elem_t pyb_spi_locals_dict_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_write_readinto),      (mp_obj_t)&pyb_spi_write_readinto_obj },
 
     // class constants
-    { MP_OBJ_NEW_QSTR(MP_QSTR_MASTER),              MP_OBJ_NEW_SMALL_INT(SPI_MODE_MASTER) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_MSB),                 MP_OBJ_NEW_SMALL_INT(PYBSPI_FIRST_BIT_MSB) },
 };