extmod/vfs_fat: Remove MICROPY_FATFS_OO config option.

Everyone should now be using the new ooFatFs library.  The old one is no
longer supported and will be removed.

extmod/vfs_fat_file.c

@@ -34,11 +34,7 @@
 #include "py/runtime.h"
 #include "py/stream.h"
 #include "py/mperrno.h"
-#if MICROPY_FATFS_OO
 #include "lib/oofatfs/ff.h"
-#else
-#include "lib/fatfs/ff.h"
-#endif
 #include "extmod/fsusermount.h"
 #include "extmod/vfs_fat.h"
 
@@ -115,11 +111,7 @@ STATIC mp_uint_t file_obj_write(mp_obj_t self_in, const void *buf, mp_uint_t siz
 STATIC mp_obj_t file_obj_close(mp_obj_t self_in) {
     pyb_file_obj_t *self = MP_OBJ_TO_PTR(self_in);
     // if fs==NULL then the file is closed and in that case this method is a no-op
-    #if MICROPY_FATFS_OO
     if (self->fp.obj.fs != NULL) {
-    #else
-    if (self->fp.fs != NULL) {
-    #endif
         FRESULT res = f_close(&self->fp);
         if (res != FR_OK) {
             mp_raise_OSError(fresult_to_errno_table[res]);
@@ -221,13 +213,8 @@ STATIC mp_obj_t file_open(fs_user_mount_t *vfs, const mp_obj_type_t *type, mp_ar
     o->base.type = type;
 
     const char *fname = mp_obj_str_get_str(args[0].u_obj);
-    #if MICROPY_FATFS_OO
     assert(vfs != NULL);
     FRESULT res = f_open(&vfs->fatfs, &o->fp, fname, mode);
-    #else
-    (void)vfs;
-    FRESULT res = f_open(&o->fp, fname, mode);
-    #endif
     if (res != FR_OK) {
         m_del_obj(pyb_file_obj_t, o);
         mp_raise_OSError(fresult_to_errno_table[res]);