iio: light: cm32181: Add mod_devicetable.h and remove of_match_ptr

Enables probing via the ACPI PRP0001 route but more is mosty about
removing examples of this that might get copied into new drivers.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alexandru Ardelean <alexandru.ardelean@analog.com>

drivers/iio/light/cm32181.c

@@ -9,6 +9,7 @@
 #include <linux/i2c.h>
 #include <linux/mutex.h>
 #include <linux/module.h>
+#include <linux/mod_devicetable.h>
 #include <linux/interrupt.h>
 #include <linux/regulator/consumer.h>
 #include <linux/iio/iio.h>
@@ -354,7 +355,7 @@ MODULE_DEVICE_TABLE(of, cm32181_of_match);
 static struct i2c_driver cm32181_driver = {
 	.driver = {
 		.name	= "cm32181",
-		.of_match_table = of_match_ptr(cm32181_of_match),
+		.of_match_table = cm32181_of_match,
 	},
 	.id_table       = cm32181_id,
 	.probe		= cm32181_probe,