staging: skein: Adds Loadable Module Support

Adds loadable module support to the Skein Hashing Algorithm driver.

Signed-off-by: Eric Rost <eric.rost@mybabylon.net>
Reviewed-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>