dt/serial: Eliminate users of of_platform_{,un}register_driver

Get rid of users of of_platform_driver in drivers/serial.  The
of_platform_{,un}register_driver functions are going away, so the
users need to be converted to using the platform_bus_type directly.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/drivers/tty/serial/sunsu.c b/drivers/tty/serial/sunsu.c
index 551ebfe..92aa545 100644
--- a/drivers/tty/serial/sunsu.c
+++ b/drivers/tty/serial/sunsu.c
@@ -1406,7 +1406,7 @@
 	return SU_PORT_PORT;
 }
 
-static int __devinit su_probe(struct platform_device *op, const struct of_device_id *match)
+static int __devinit su_probe(struct platform_device *op)
 {
 	static int inst;
 	struct device_node *dp = op->dev.of_node;
@@ -1543,7 +1543,7 @@
 };
 MODULE_DEVICE_TABLE(of, su_match);
 
-static struct of_platform_driver su_driver = {
+static struct platform_driver su_driver = {
 	.driver = {
 		.name = "su",
 		.owner = THIS_MODULE,
@@ -1586,7 +1586,7 @@
 			return err;
 	}
 
-	err = of_register_platform_driver(&su_driver);
+	err = platform_driver_register(&su_driver);
 	if (err && num_uart)
 		sunserial_unregister_minors(&sunsu_reg, num_uart);