const_structs.checkpatch.pl: add kobj_type

Since commit ee6d3dd4 ("driver core: make kobj_type constant.")
the driver core allows the usage of const struct kobj_type.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20230204-kobj_type-checkpatch-v1-1-9a94b04adbb2@weissschuh.netSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

scripts/const_structs.checkpatch

@@ -35,6 +35,7 @@ iwl_ops
 kernel_param_ops
 kgdb_arch
 kgdb_io
+kobj_type
 kset_uevent_ops
 lock_manager_operations
 machine_desc