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/arm_pl180_mmci.c b/drivers/mmc/arm_pl180_mmci.c
index 6c118b4..6d983d0 100644
--- a/drivers/mmc/arm_pl180_mmci.c
+++ b/drivers/mmc/arm_pl180_mmci.c
@@ -552,6 +552,6 @@
 	.ofdata_to_platdata = arm_pl180_mmc_ofdata_to_platdata,
 	.bind = arm_pl180_mmc_bind,
 	.priv_auto	= sizeof(struct pl180_mmc_host),
-	.platdata_auto	= sizeof(struct arm_pl180_mmc_plat),
+	.plat_auto	= sizeof(struct arm_pl180_mmc_plat),
 };
 #endif