dm: treewide: Rename 'platdata' variables to just 'plat'

We use 'priv' for private data but often use 'platdata' for platform data.
We can't really use 'pdata' since that is ambiguous (it could mean private
or platform data).

Rename some of the latter variables to end with 'plat' for consistency.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/timer/atmel_pit_timer.c b/drivers/timer/atmel_pit_timer.c
index a0daf49..226c680 100644
--- a/drivers/timer/atmel_pit_timer.c
+++ b/drivers/timer/atmel_pit_timer.c
@@ -81,7 +81,7 @@
 	.id	= UCLASS_TIMER,
 	.of_match = atmel_pit_ids,
 	.ofdata_to_platdata = atmel_pit_ofdata_to_platdata,
-	.platdata_auto	= sizeof(struct atmel_pit_platdata),
+	.plat_auto	= sizeof(struct atmel_pit_platdata),
 	.probe	= atmel_pit_probe,
 	.ops	= &atmel_pit_ops,
 };