power: supply: ab8500: Constify struct kobj_type

This 'struct kobj_type' is not modified. It is only used in
kobject_init_and_add() which takes a 'const struct kobj_type *ktype'
parameter.

Constifying this structure and moving it to a read-only section,
and can increase over all security.
Signed-off-by: Hongbo Li <lihongbo22@huawei.com>
Link: https://lore.kernel.org/r/20240904011434.2010118-1-lihongbo22@huawei.comSigned-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/ab8500_fg.c

@@ -2531,7 +2531,7 @@ static struct attribute *ab8500_fg_attrs[] = {
 };
 ATTRIBUTE_GROUPS(ab8500_fg);
 
-static struct kobj_type ab8500_fg_ktype = {
+static const struct kobj_type ab8500_fg_ktype = {
 	.sysfs_ops = &ab8500_fg_sysfs_ops,
 	.default_groups = ab8500_fg_groups,
 };