const_structs.checkpatch: add device_type

Since commit aed65af ("drivers: make device_type const"), the driver
core can properly handle constant struct device_type.  Make sure that new
usages of the struct already enter the tree as const.

Link: https://lkml.kernel.org/r/20240218-device_cleanup-checkpatch-v1-1-8b0b89c4f6b1@marliere.net
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: rbmarliere

scripts/const_structs.checkpatch

@@ -8,6 +8,7 @@ comedi_lrange
 component_ops
 dentry_operations
 dev_pm_ops
+device_type
 dma_map_ops
 driver_info
 drm_connector_funcs