drm/panel: panel-orisetech-otm8009a: Include <linux/mod_devicetable.h>

Include <linux/mod_devicetable.h> directly to get struct of_device_id.
Avoids the proxy include via <linux/backlight.h>

Signed-off-by: Thomas Zimmermann <[e-mail]>
Cc: Neil Armstrong <[e-mail]>
Cc: Jessica Zhang <[e-mail]>
Reviewed-by: Neil Armstrong <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/panel/panel-orisetech-otm8009a.c

···
 #include <linux/backlight.h>
 #include <linux/delay.h>
 #include <linux/gpio/consumer.h>
+#include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/regulator/consumer.h>