[zfs-code] Codereview: 6344836 ZFS should use SHA256 from crypto framework

[Lin Ling]

Darren J Moffat wrote:

>
> http://cr.grommit.com/~darrenm/6344836/
>
> I'm not sure if there is any impact to ZFS boot from this change.
>

ZFS boot has its own copy of SHA256.

Lin