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/w1/mxc_w1.c b/drivers/w1/mxc_w1.c
index aced1b0..d8cbff7 100644
--- a/drivers/w1/mxc_w1.c
+++ b/drivers/w1/mxc_w1.c
@@ -230,6 +230,6 @@
 	.of_match			= mxc_w1_id,
 	.ofdata_to_platdata		= mxc_w1_ofdata_to_platdata,
 	.ops				= &mxc_w1_ops,
-	.platdata_auto	= sizeof(struct mxc_w1_pdata),
+	.plat_auto	= sizeof(struct mxc_w1_pdata),
 	.probe				= mxc_w1_probe,
 };