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/video/tegra124/dp.c b/drivers/video/tegra124/dp.c
index 881923f..8519b53 100644
--- a/drivers/video/tegra124/dp.c
+++ b/drivers/video/tegra124/dp.c
@@ -1596,7 +1596,7 @@
 {
 	struct tegra_dp_plat *plat = dev_get_platdata(dev);
 	struct tegra_dp_priv *priv = dev_get_priv(dev);
-	struct display_plat *disp_uc_plat = dev_get_uclass_platdata(dev);
+	struct display_plat *disp_uc_plat = dev_get_uclass_plat(dev);
 
 	priv->regs = (struct dpaux_ctlr *)plat->base;
 	priv->enabled = false;
@@ -1620,5 +1620,5 @@
 	.probe	= dp_tegra_probe,
 	.ops	= &dp_tegra_ops,
 	.priv_auto	= sizeof(struct tegra_dp_priv),
-	.platdata_auto	= sizeof(struct tegra_dp_plat),
+	.plat_auto	= sizeof(struct tegra_dp_plat),
 };