statx: hide interfaces no longer used by io_uring

The io_uring interfaces have been replaced by do_statx() and are no
longer needed.

Signed-off-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/internal.h

@@ -186,7 +186,5 @@ int sb_init_dio_done_wq(struct super_block *sb);
 /*
  * fs/stat.c:
  */
-unsigned vfs_stat_set_lookup_flags(unsigned *lookup_flags, int flags);
-int cp_statx(const struct kstat *stat, struct statx __user *buffer);
 int do_statx(int dfd, const char __user *filename, unsigned flags,
 	     unsigned int mask, struct statx __user *buffer);