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/aspeed_sdhci.c b/drivers/mmc/aspeed_sdhci.c
index 4bf02c3..1e340f8 100644
--- a/drivers/mmc/aspeed_sdhci.c
+++ b/drivers/mmc/aspeed_sdhci.c
@@ -87,5 +87,5 @@
 	.bind		= aspeed_sdhci_bind,
 	.probe		= aspeed_sdhci_probe,
 	.priv_auto	= sizeof(struct sdhci_host),
-	.platdata_auto	= sizeof(struct aspeed_sdhci_plat),
+	.plat_auto	= sizeof(struct aspeed_sdhci_plat),
 };