hcrypto: Add exports for more crypto algorithms

hcrypto: Add exports for more crypto algorithms

Export some additional algorithms so we can make use
of them elsewhere in the code.

Change-Id: I676318a872a1e7b537112a3d60dac2edff478ae6
Reviewed-on: http://gerrit.openafs.org/10047
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Simon Wilkinson <simonxwilkinson@gmail.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>