iio: stmpe-adc: Add compatible name

Add the compatible name to the driver so it gets loaded when the proper
node in DT is detected.
Signed-off-by: NPhilippe Schenker <philippe.schenker@toradex.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/stmpe-adc.c

@@ -351,9 +351,14 @@ static struct platform_driver stmpe_adc_driver = {
 		.pm	= &stmpe_adc_pm_ops,
 	},
 };
-
 module_platform_driver(stmpe_adc_driver);
 
+static const struct of_device_id stmpe_adc_ids[] = {
+	{ .compatible = "st,stmpe-adc", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, stmpe_adc_ids);
+
 MODULE_AUTHOR("Stefan Agner <stefan.agner@toradex.com>");
 MODULE_DESCRIPTION("STMPEXXX ADC driver");
 MODULE_LICENSE("GPL v2");