[CRYPTO] scatterwalk: Move scatterwalk.h to linux/crypto

The scatterwalk infrastructure is used by algorithms so it needs to
move out of crypto for future users that may live in drivers/crypto
or asm/*/crypto.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c
index 180d914..7939504 100644
--- a/crypto/blkcipher.c
+++ b/crypto/blkcipher.c
@@ -14,6 +14,7 @@
  *
  */
 
+#include <crypto/scatterwalk.h>
 #include <linux/crypto.h>
 #include <linux/errno.h>
 #include <linux/hardirq.h>
@@ -25,7 +26,6 @@
 #include <linux/string.h>
 
 #include "internal.h"
-#include "scatterwalk.h"
 
 enum {
 	BLKCIPHER_WALK_PHYS = 1 << 0,