mm/damon/sysfs: make more kobj_type structures constant

Since commit ee6d3dd ("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 definition to prevent
modification at runtime.

These structures were not constified in commit e56397e
("mm/damon/sysfs: make kobj_type structures constant") as they didn't
exist when that patch was written.

Link: https://lkml.kernel.org/r/20230324-b4-kobj_type-damon2-v1-1-48ddbf1c8fcf@weissschuh.net
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: SeongJae Park <sj@kernel.org>
Reviewed-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/damon/sysfs-schemes.c

@@ -384,7 +384,7 @@ static struct attribute *damon_sysfs_scheme_filter_attrs[] = {
 };
 ATTRIBUTE_GROUPS(damon_sysfs_scheme_filter);
 
-static struct kobj_type damon_sysfs_scheme_filter_ktype = {
+static const struct kobj_type damon_sysfs_scheme_filter_ktype = {
 	.release = damon_sysfs_scheme_filter_release,
 	.sysfs_ops = &kobj_sysfs_ops,
 	.default_groups = damon_sysfs_scheme_filter_groups,
@@ -503,7 +503,7 @@ static struct attribute *damon_sysfs_scheme_filters_attrs[] = {
 };
 ATTRIBUTE_GROUPS(damon_sysfs_scheme_filters);
 
-static struct kobj_type damon_sysfs_scheme_filters_ktype = {
+static const struct kobj_type damon_sysfs_scheme_filters_ktype = {
 	.release = damon_sysfs_scheme_filters_release,
 	.sysfs_ops = &kobj_sysfs_ops,
 	.default_groups = damon_sysfs_scheme_filters_groups,