crypto: crypto4xx - convert to skcipher

The ablkcipher APIs have been effectively deprecated since [1].
This patch converts the crypto4xx driver to the new skcipher APIs.

[1] <https://www.spinics.net/lists/linux-crypto/msg18133.html

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Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>