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 <[e-mail]>
Reviewed-by: Nick Chan <[e-mail]>
Reviewed-by: "Daniel Thompson (RISCstar)" <[e-mail]>
Acked-by: Duje Mihanović <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/video/backlight/ktd2801-backlight.c

···
 #include <linux/backlight.h>
 #include <linux/gpio/consumer.h>
 #include <linux/leds-expresswire.h>
+#include <linux/mod_devicetable.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>