Input: stmpe-ts - fix automatic module loading

When STMPE is instantiated via device tree individual MFD cells rae formed
with OF modaliases, not platform modaliases, and so we need to add OF
device table to the driver if we want it to load automatically:

of:Nstmpe_touchscreenT<NULL>Cst,stmpe-ts
Reported-by: Heiner Kallweit <hkallweit1@gmail.com>
Tested-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/stmpe-ts.c

@@ -390,6 +390,14 @@ static struct platform_driver stmpe_ts_driver = {
 };
 module_platform_driver(stmpe_ts_driver);
 
+#ifdef CONFIG_OF
+static const struct of_device_id stmpe_ts_ids[] = {
+	{ .compatible = "st,stmpe-ts", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, stmpe_ts_ids);
+#endif
+
 MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
 MODULE_DESCRIPTION("STMPEXXX touchscreen driver");
 MODULE_LICENSE("GPL");