lients needs to handle error codes and may repeat hash calculation attempt.

Also in the case of DMA error, SHAM module is set to be re-initialized again.
It significantly improves stability against possible HW failures.

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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