SUNRPC: use default_groups in kobj_type

There are currently 2 ways to create a set of sysfs files for a
kobj_type, through the default_attrs field, and the default_groups
field.  Move the sunrpc sysfs code to use default_groups field which has
been the preferred way since aa30f47c ("kobject: Add support for
default attribute groups to kobj_type") so that we can soon get rid of
the obsolete default_attrs field.

Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: Anna Schumaker <anna.schumaker@netapp.com>
Cc: linux-nfs@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

net/sunrpc/sysfs.c

@@ -422,6 +422,7 @@ static struct attribute *rpc_sysfs_xprt_attrs[] = {
 	&rpc_sysfs_xprt_change_state.attr,
 	NULL,
 };
+ATTRIBUTE_GROUPS(rpc_sysfs_xprt);
 
 static struct kobj_attribute rpc_sysfs_xprt_switch_info =
 	__ATTR(xprt_switch_info, 0444, rpc_sysfs_xprt_switch_info_show, NULL);
@@ -430,6 +431,7 @@ static struct attribute *rpc_sysfs_xprt_switch_attrs[] = {
 	&rpc_sysfs_xprt_switch_info.attr,
 	NULL,
 };
+ATTRIBUTE_GROUPS(rpc_sysfs_xprt_switch);
 
 static struct kobj_type rpc_sysfs_client_type = {
 	.release = rpc_sysfs_client_release,
@@ -439,14 +441,14 @@ static struct kobj_type rpc_sysfs_client_type = {
 
 static struct kobj_type rpc_sysfs_xprt_switch_type = {
 	.release = rpc_sysfs_xprt_switch_release,
-	.default_attrs = rpc_sysfs_xprt_switch_attrs,
+	.default_groups = rpc_sysfs_xprt_switch_groups,
 	.sysfs_ops = &kobj_sysfs_ops,
 	.namespace = rpc_sysfs_xprt_switch_namespace,
 };
 
 static struct kobj_type rpc_sysfs_xprt_type = {
 	.release = rpc_sysfs_xprt_release,
-	.default_attrs = rpc_sysfs_xprt_attrs,
+	.default_groups = rpc_sysfs_xprt_groups,
 	.sysfs_ops = &kobj_sysfs_ops,
 	.namespace = rpc_sysfs_xprt_namespace,
 };