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

Get rid of users of of_platform_driver in drivers/spi.  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>
diff --git a/drivers/spi/spi_ppc4xx.c b/drivers/spi/spi_ppc4xx.c
index 80e172d..2a298c0 100644
--- a/drivers/spi/spi_ppc4xx.c
+++ b/drivers/spi/spi_ppc4xx.c
@@ -390,8 +390,7 @@
 /*
  * platform_device layer stuff...
  */
-static int __init spi_ppc4xx_of_probe(struct platform_device *op,
-				      const struct of_device_id *match)
+static int __init spi_ppc4xx_of_probe(struct platform_device *op)
 {
 	struct ppc4xx_spi *hw;
 	struct spi_master *master;
@@ -586,7 +585,7 @@
 
 MODULE_DEVICE_TABLE(of, spi_ppc4xx_of_match);
 
-static struct of_platform_driver spi_ppc4xx_of_driver = {
+static struct platform_driver spi_ppc4xx_of_driver = {
 	.probe = spi_ppc4xx_of_probe,
 	.remove = __exit_p(spi_ppc4xx_of_remove),
 	.driver = {
@@ -598,13 +597,13 @@
 
 static int __init spi_ppc4xx_init(void)
 {
-	return of_register_platform_driver(&spi_ppc4xx_of_driver);
+	return platform_driver_register(&spi_ppc4xx_of_driver);
 }
 module_init(spi_ppc4xx_init);
 
 static void __exit spi_ppc4xx_exit(void)
 {
-	of_unregister_platform_driver(&spi_ppc4xx_of_driver);
+	platform_driver_unregister(&spi_ppc4xx_of_driver);
 }
 module_exit(spi_ppc4xx_exit);