crypto: amlogic - 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: 48fe583f

 ("crypto: amlogic - Add crypto accelerator for amlogic GXL")

Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>