dm: treewide: Rename ..._platdata variables to just ..._plat

Try to maintain some consistency between these variables by using _plat as
a suffix for them.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/cpu.c b/cmd/cpu.c
index d32e2a4..a26234a 100644
--- a/cmd/cpu.c
+++ b/cmd/cpu.c
@@ -26,7 +26,7 @@
 	for (uclass_first_device(UCLASS_CPU, &dev);
 		     dev;
 		     uclass_next_device(&dev)) {
-		struct cpu_platdata *plat = dev_get_parent_plat(dev);
+		struct cpu_plat *plat = dev_get_parent_plat(dev);
 		struct cpu_info info;
 		bool first = true;
 		int ret, i;