iio:adc:ti-adc161s626: Drop of_match_ptr protection.

Dropping this allows use of ACPI PRP0001.

I'm also looking to drop all of_match_ptr use in IIO in order to avoid
it getting cut and paste into new drivers in the future.

Also add a direct include of mod_devicetable.h to reflect the use
of struct of_device_id.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Matt Ranostay <matt.ranostay@konsulko.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

drivers/iio/adc/ti-adc161s626.c

@@ -11,6 +11,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/mod_devicetable.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/spi/spi.h>
@@ -257,7 +258,7 @@ MODULE_DEVICE_TABLE(spi, ti_adc_id);
 static struct spi_driver ti_adc_driver = {
 	.driver = {
 		.name	= TI_ADC_DRV_NAME,
-		.of_match_table = of_match_ptr(ti_adc_dt_ids),
+		.of_match_table = ti_adc_dt_ids,
 	},
 	.probe		= ti_adc_probe,
 	.remove		= ti_adc_remove,