s390x: Optimize kmac

Use hardware acceleration for kmac on s390x.  Since klmd does not support
kmac, perform padding of the last block by hand and use kimd.  Yields a
performance improvement of between 2x and 3x.

Signed-off-by: Juergen Christ <jchrist@linux.ibm.com>

Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18863)

(cherry picked from commit affc070a)