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/video/aty/radeon_pm.c b/drivers/video/aty/radeon_pm.c
index 1786ae1..c411293 100644
--- a/drivers/video/aty/radeon_pm.c
+++ b/drivers/video/aty/radeon_pm.c
@@ -1290,7 +1290,7 @@
 		if (rinfo->of_node != NULL) {
 			int size;
 
-			mrtable = of_get_property(rinfo->of_node, "ATY,MRT", &size);
+			mrtable = get_property(rinfo->of_node, "ATY,MRT", &size);
 			if (mrtable)
 				mrtable_size = size >> 2;
 			else