crypto: nitrox - remove cra_type reference to ablkcipher

Setting the cra_type field is not necessary for skciphers, and ablkcipher
will be removed, so drop the assignment from the nitrox driver.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>