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/drivers/timer/timer-uclass.c b/drivers/timer/timer-uclass.c
index a15198c..ab53555 100644
--- a/drivers/timer/timer-uclass.c
+++ b/drivers/timer/timer-uclass.c
@@ -90,7 +90,7 @@
 int timer_timebase_fallback(struct udevice *dev)
 {
 	struct udevice *cpu;
-	struct cpu_platdata *cpu_plat;
+	struct cpu_plat *cpu_plat;
 	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
 
 	/* Did we get our clock rate from the device tree? */