crypto: marvell/cesa - factor out common import/export functions

As all the import functions and export functions are virtually
identical, factor out their common parts into a generic
mv_cesa_ahash_import() and mv_cesa_ahash_export() respectively.  This
performs the actual import or export, and we pass the data pointers and
length into these functions.

We have to switch a % const operation to do_div() in the common import
function to avoid provoking gcc to use the expensive 64-bit by 64-bit
modulus operation.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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