crypto: sun4i-ss - Handle better absence/presence of IV

This patch remove the test against areq->info since sun4i-ss could work
without it (ECB).

Fixes: 6298e948 ("crypto: sunxi-ss - Add Allwinner Security System crypto accelerator")
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>