crypto: sha512 - Expose generic sha512 routine to be callable from other modules

Other SHA512 routines may need to use the generic routine when
FPU is not available.

Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/include/crypto/sha.h b/include/crypto/sha.h
index f46ff61..190f8a0 100644
--- a/include/crypto/sha.h
+++ b/include/crypto/sha.h
@@ -89,4 +89,7 @@
 
 extern int crypto_sha256_update(struct shash_desc *desc, const u8 *data,
 			      unsigned int len);
+
+extern int crypto_sha512_update(struct shash_desc *desc, const u8 *data,
+			      unsigned int len);
 #endif