net-sysfs: make kobj_type structures constant

Since commit ee6d3dd4 ("driver core: make kobj_type constant.")
the driver core allows the usage of const struct kobj_type.

Take advantage of this to constify the structure definitions to prevent
modification at runtime.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/core/net-sysfs.c

@@ -1052,7 +1052,7 @@ static void rx_queue_get_ownership(const struct kobject *kobj,
 	net_ns_get_ownership(net, uid, gid);
 }
 
-static struct kobj_type rx_queue_ktype __ro_after_init = {
+static const struct kobj_type rx_queue_ktype = {
 	.sysfs_ops = &rx_queue_sysfs_ops,
 	.release = rx_queue_release,
 	.default_groups = rx_queue_default_groups,
@@ -1662,7 +1662,7 @@ static void netdev_queue_get_ownership(const struct kobject *kobj,
 	net_ns_get_ownership(net, uid, gid);
 }
 
-static struct kobj_type netdev_queue_ktype __ro_after_init = {
+static const struct kobj_type netdev_queue_ktype = {
 	.sysfs_ops = &netdev_queue_sysfs_ops,
 	.release = netdev_queue_release,
 	.default_groups = netdev_queue_default_groups,