Platform: OLPC: add SPI MODULE_DEVICE_TABLE

The SPI bus creates a device with the modalias of "xo1.75-ec". This
fixes XO-1.75 EC driver autoloading

Fixes: 0c3d931b ("Platform: OLPC: Add XO-1.75 EC driver")
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/platform/olpc/olpc-xo175-ec.c

@@ -736,6 +736,12 @@ static const struct of_device_id olpc_xo175_ec_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, olpc_xo175_ec_of_match);
 
+static const struct spi_device_id olpc_xo175_ec_id_table[] = {
+	{ "xo1.75-ec", 0 },
+	{}
+};
+MODULE_DEVICE_TABLE(spi, olpc_xo175_ec_id_table);
+
 static struct spi_driver olpc_xo175_ec_spi_driver = {
 	.driver = {
 		.name	= "olpc-xo175-ec",