afs: remove afs_cache_netfs and afs_zap_permits() declarations

afs_zap_permits() has been removed since
commit be080a6f43c4 ("afs: Overhaul permit caching").

afs_cache_netfs has been removed since
commit 523d27cda149 ("afs: Convert afs to use the new fscache API").

so remove the declare for them from header file.

Signed-off-by: Gaosheng Cui <[e-mail]>
Signed-off-by: David Howells <[e-mail]>
cc: Marc Dionne <[e-mail]>
cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]/

fs/afs/internal.h

···
 extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16);
 
 /*
- * cache.c
- */
-#ifdef CONFIG_AFS_FSCACHE
-extern struct fscache_netfs afs_cache_netfs;
-#endif
-
-/*
  * callback.c
  */
 extern void afs_invalidate_mmap_work(struct work_struct *);
···
 extern void afs_clear_permits(struct afs_vnode *);
 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int,
 			     struct afs_status_cb *);
-extern void afs_zap_permits(struct rcu_head *);
 extern struct key *afs_request_key(struct afs_cell *);
 extern struct key *afs_request_key_rcu(struct afs_cell *);
 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *);