crypto: nx - Constify static attribute_group structs

The only usage of these is to pass their address to
sysfs_{create,remove}_group(), which takes pointers to const struct
attribute_group. Make them const to allow the compiler to put them in
read-only memory.
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Reviewed-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/nx/nx-common-pseries.c

@@ -962,7 +962,7 @@ static struct attribute *nx842_sysfs_entries[] = {
 	NULL,
 };
 
-static struct attribute_group nx842_attribute_group = {
+static const struct attribute_group nx842_attribute_group = {
 	.name = NULL,		/* put in device directory */
 	.attrs = nx842_sysfs_entries,
 };
@@ -992,7 +992,7 @@ static struct attribute *nxcop_caps_sysfs_entries[] = {
 	NULL,
 };
 
-static struct attribute_group nxcop_caps_attr_group = {
+static const struct attribute_group nxcop_caps_attr_group = {
 	.name	=	"nx_gzip_caps",
 	.attrs	=	nxcop_caps_sysfs_entries,
 };