mtd: remove unused default_mtd_readv prototype

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

include/linux/mtd/mtd.h

@@ -485,9 +485,6 @@ extern int unregister_mtd_user (struct mtd_notifier *old);
 int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
 		       unsigned long count, loff_t to, size_t *retlen);
 
-int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
-		      unsigned long count, loff_t from, size_t *retlen);
-
 void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size);
 
 void mtd_erase_callback(struct erase_info *instr);