crypto: s390 - add System z hardware support for GHASH

This patch adds System z hardware acceleration support for the GHASH
algorithm for GCM (Galois/Counter Mode).
The hardware support is available beginning with System z196.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --cc arch/s390/crypto/Makefile
Simple merge

diff --cc arch/s390/crypto/crypt_s390.h
Simple merge

diff --cc arch/s390/crypto/ghash_s390.c
Simple merge

diff --cc drivers/crypto/Kconfig
Simple merge