[IPSEC] ESP: Use block ciphers where applicable

This patch converts IPSec/ESP to use the new block cipher type where
applicable.  Similar to the HMAC conversion, existing algorithm names
have been kept for compatibility.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/include/net/esp.h b/include/net/esp.h
index 6eb8379..af2ff18 100644
--- a/include/net/esp.h
+++ b/include/net/esp.h
@@ -22,7 +22,7 @@
 		 * >= crypto_tfm_alg_ivsize(tfm). */
 		int			ivlen;
 		int			padlen;		/* 0..255 */
-		struct crypto_tfm	*tfm;		/* crypto handle */
+		struct crypto_blkcipher	*tfm;		/* crypto handle */
 	} conf;
 
 	/* Integrity. It is active when icv_full_len != 0 */