crypto: sha512_generic - Use 64-bit counters

This patch replaces the 32-bit counters in sha512_generic with
64-bit counters.  It also switches the bit count to the simpler
byte count.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/include/crypto/sha.h b/include/crypto/sha.h
index 45b25cc..069e85b 100644
--- a/include/crypto/sha.h
+++ b/include/crypto/sha.h
@@ -77,9 +77,9 @@
 };
 
 struct sha512_state {
-	u64 state[8];
-	u32 count[4];
-	u8 buf[128];
+	u64 count[2];
+	u64 state[SHA512_DIGEST_SIZE / 8];
+	u8 buf[SHA512_BLOCK_SIZE];
 };
 
 #endif