crypto: sun8i-ce - fix removal of module

Removing the driver cause an oops due to the fact we clean an extra
channel.
Let's give the right index to the cleaning function.

Fixes: 06f751b6 ("crypto: allwinner - Add sun8i-ce Crypto Engine")
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>