[CRYPTO] geode: do not copy the IV too often

There is no reason to keep the IV in the private structre. Instead keep
just a pointer to make the patch smaller :)
This also remove a few memcpy()s

Signed-off-by: Sebastian Siewior <sebastian@breakpoint.cc>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/geode-aes.h b/drivers/crypto/geode-aes.h
index 14cc763..f1855b5 100644
--- a/drivers/crypto/geode-aes.h
+++ b/drivers/crypto/geode-aes.h
@@ -65,7 +65,7 @@
 	int len;
 
 	u8 key[AES_KEY_LENGTH];
-	u8 iv[AES_IV_LENGTH];
+	u8 *iv;
 
 	union {
 		struct crypto_blkcipher *blk;