esp8266: Enable MICROPY_PY_IO_FILEIO to get compliant text/binary streams.

esp8266/mpconfigport.h

@@ -42,6 +42,7 @@
 #define MICROPY_PY_MATH             (1)
 #define MICROPY_PY_CMATH            (0)
 #define MICROPY_PY_IO               (1)
+#define MICROPY_PY_IO_FILEIO        (1)
 #define MICROPY_PY_STRUCT           (1)
 #define MICROPY_PY_SYS              (1)
 #define MICROPY_PY_SYS_MAXSIZE      (1)
@@ -114,6 +115,9 @@ typedef uint32_t sys_prot_t; // for modlwip
 
 #define MP_PLAT_PRINT_STRN(str, len) mp_hal_stdout_tx_strn_cooked(str, len)
 
+#define mp_type_fileio fatfs_type_fileio
+#define mp_type_textio fatfs_type_textio
+
 // extra built in names to add to the global namespace
 #define MICROPY_PORT_BUILTINS \
     { MP_OBJ_NEW_QSTR(MP_QSTR_help), (mp_obj_t)&mp_builtin_help_obj }, \