crypto: sa2ul - change unsafe data size limit to 255 bytes

256 bytes is quite often used in performance benchmarks and this size
appears to be also working just fine, so mark it as safe so that we do
not fallback to software implementation for this packet size. Otherwise
there is a strange bump up in crypto performance at 256 byte packet size.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/sa2ul.h

@@ -170,7 +170,7 @@ struct sa_tfm_ctx;
  * the following range, so avoid using it.
  */
 #define SA_UNSAFE_DATA_SZ_MIN	240
-#define SA_UNSAFE_DATA_SZ_MAX	256
+#define SA_UNSAFE_DATA_SZ_MAX	255
 
 struct sa_match_data;