crypto: nx - Migrate to scomp API

The only remaining user of 842 compression has been migrated to the
acomp compression API, and so the NX hardware driver has to follow suit,
given that no users of the obsolete 'comp' API remain, and it is going
to be removed.

So migrate the NX driver code to scomp. These will be wrapped and
exposed as acomp implementation via the crypto subsystem's
acomp-to-scomp adaptation layer.

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