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

Get rid of old users of of_platform_driver in arch/powerpc.  Most
of_platform_driver users can be converted to use the platform_bus
directly.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c
index 2659a60..27402c7d 100644
--- a/arch/powerpc/sysdev/axonram.c
+++ b/arch/powerpc/sysdev/axonram.c
@@ -172,10 +172,9 @@
 
 /**
  * axon_ram_probe - probe() method for platform driver
- * @device, @device_id: see of_platform_driver method
+ * @device: see platform_driver method
  */
-static int axon_ram_probe(struct platform_device *device,
-			  const struct of_device_id *device_id)
+static int axon_ram_probe(struct platform_device *device)
 {
 	static int axon_ram_bank_id = -1;
 	struct axon_ram_bank *bank;
@@ -326,7 +325,7 @@
 	{}
 };
 
-static struct of_platform_driver axon_ram_driver = {
+static struct platform_driver axon_ram_driver = {
 	.probe		= axon_ram_probe,
 	.remove		= axon_ram_remove,
 	.driver = {
@@ -350,7 +349,7 @@
 	}
 	azfs_minor = 0;
 
-	return of_register_platform_driver(&axon_ram_driver);
+	return platform_driver_register(&axon_ram_driver);
 }
 
 /**
@@ -359,7 +358,7 @@
 static void __exit
 axon_ram_exit(void)
 {
-	of_unregister_platform_driver(&axon_ram_driver);
+	platform_driver_unregister(&axon_ram_driver);
 	unregister_blkdev(azfs_major, AXON_RAM_DEVICE_NAME);
 }