iio: dac: ad8460: add SPI device match table

Add SPI device match table for ADI AD8460 DAC. As described in [1], this
is required for the module to automatically load, even when using DT.

[1]: https://lore.kernel.org/all/20210921192149.50740-1-broonie@kernel.org/

Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20241018-iio-dac-ad8460-add-spi-match-table-v1-1-84a5f903bf50@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Author: dlech

drivers/iio/dac/ad8460.c

@@ -927,12 +927,19 @@ static const struct of_device_id ad8460_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, ad8460_of_match);
 
+static const struct spi_device_id ad8460_spi_match[] = {
+	{ .name = "ad8460" },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, ad8460_spi_match);
+
 static struct spi_driver ad8460_driver = {
 	.driver = {
 		.name = "ad8460",
 		.of_match_table = ad8460_of_match,
 	},
 	.probe = ad8460_probe,
+	.id_table = ad8460_spi_match,
 };
 module_spi_driver(ad8460_driver);