Revert "[POWERPC] Rename get_property to of_get_property: drivers"

This reverts commit d05c7a80cf39ae7d0f8d0c3e47c93d51fcd393d3,
which included changes which should go via other subsystem
maintainers.
diff --git a/drivers/macintosh/rack-meter.c b/drivers/macintosh/rack-meter.c
index 4177ff0..f83fad2 100644
--- a/drivers/macintosh/rack-meter.c
+++ b/drivers/macintosh/rack-meter.c
@@ -387,7 +387,7 @@
 	       if (strcmp(np->name, "lightshow") == 0)
 		       break;
 	       if ((strcmp(np->name, "sound") == 0) &&
-		   of_get_property(np, "virtual", NULL) != NULL)
+		   get_property(np, "virtual", NULL) != NULL)
 		       break;
 	}
 	if (np == NULL) {