Support for new versions of cryptodev modules

Newer versions of cryptodev have a breaking change [1] for SHA-256. This is a workaround.

[1] https://github.com/nmav/cryptodev-linux/commit/d87ab5584893d06a21fe7cbf6e052d6757f9aa91#diff-535166266eead3c57bed2059c5006818