net: wan: slic_ds26522: add SPI device ID table to fix module autoload

If the driver is built as a module, module alias information isn't filled
so the module won't be autoloaded. Add a SPI device ID table and use the
MODULE_DEVICE_TABLE() macro so the information is exported in the module.

Before this patch:

$ modinfo drivers/net/wan/slic_ds26522.ko | grep alias
$

After this patch:

$ modinfo drivers/net/wan/slic_ds26522.ko | grep alias
alias:          spi:ds26522
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wan/slic_ds26522.c

@@ -223,6 +223,12 @@ static int slic_ds26522_probe(struct spi_device *spi)
 	return ret;
 }
 
+static const struct spi_device_id slic_ds26522_id[] = {
+	{ .name = "ds26522" },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(spi, slic_ds26522_id);
+
 static const struct of_device_id slic_ds26522_match[] = {
 	{
 	 .compatible = "maxim,ds26522",
@@ -239,6 +245,7 @@ static struct spi_driver slic_ds26522_driver = {
 		   },
 	.probe = slic_ds26522_probe,
 	.remove = slic_ds26522_remove,
+	.id_table = slic_ds26522_id,
 };
 
 static int __init slic_ds26522_init(void)