staging: iio: ad2s1210: Add device tree table.

Add device tree table for matching vendor ID.

Note that as the driver is still heavily in flux and there are some
non obvious aspects to a comprehensive binding, that binding will
be submitted at a later date (before leaving staging!)
Signed-off-by: Nishad Kamdar <nishadkamdar@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/staging/iio/resolver/ad2s1210.c

@@ -699,6 +699,12 @@ static int ad2s1210_remove(struct spi_device *spi)
 	return 0;
 }
 
+static const struct of_device_id ad2s1210_of_match[] = {
+	{ .compatible = "adi,ad2s1210", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ad2s1210_of_match);
+
 static const struct spi_device_id ad2s1210_id[] = {
 	{ "ad2s1210" },
 	{}
@@ -708,6 +714,7 @@ MODULE_DEVICE_TABLE(spi, ad2s1210_id);
 static struct spi_driver ad2s1210_driver = {
 	.driver = {
 		.name = DRV_NAME,
+		.of_match_table = of_match_ptr(ad2s1210_of_match),
 	},
 	.probe = ad2s1210_probe,
 	.remove = ad2s1210_remove,