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/mmc/ftsdc010_mci.c b/drivers/mmc/ftsdc010_mci.c
index 5d312df..196c527 100644
--- a/drivers/mmc/ftsdc010_mci.c
+++ b/drivers/mmc/ftsdc010_mci.c
@@ -478,5 +478,5 @@
 	.bind		= ftsdc010_mmc_bind,
 	.probe		= ftsdc010_mmc_probe,
 	.priv_auto	= sizeof(struct ftsdc_priv),
-	.platdata_auto	= sizeof(struct ftsdc010_plat),
+	.plat_auto	= sizeof(struct ftsdc010_plat),
 };