backlight: ktd2801: Include <linux/mod_devicetable.h>

backlight: ktd2801: Include <linux/mod_devicetable.h>

Include <linux/mod_devicetable.h> to declare struct of_device_id.
Avoids dependency on backlight header to include it.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Nick Chan <towinchenmi@gmail.com>
Reviewed-by: "Daniel Thompson (RISCstar)" <danielt@kernel.org>
Acked-by: Duje Mihanović <duje.mihanovic@skole.hr>
Link: https://lore.kernel.org/r/20250715122643.137027-12-tzimmermann@suse.de
Signed-off-by: Lee Jones <lee@kernel.org>