spi: spi-mux: Add module info needed for autoloading

With the spi device table udev can autoload the spi-mux module in
the presence of an spi-mux device.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20210721095321.2165453-1-u.kleine-koenig@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-mux.c

@@ -167,10 +167,17 @@ static int spi_mux_probe(struct spi_device *spi)
 	return ret;
 }
 
+static const struct spi_device_id spi_mux_id[] = {
+	{ "spi-mux" },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, spi_mux_id);
+
 static const struct of_device_id spi_mux_of_match[] = {
 	{ .compatible = "spi-mux" },
 	{ }
 };
+MODULE_DEVICE_TABLE(of, spi_mux_of_match);
 
 static struct spi_driver spi_mux_driver = {
 	.probe  = spi_mux_probe,
@@ -178,6 +185,7 @@ static struct spi_driver spi_mux_driver = {
 		.name   = "spi-mux",
 		.of_match_table = spi_mux_of_match,
 	},
+	.id_table = spi_mux_id,
 };
 
 module_spi_driver(spi_mux_driver);