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/display-uclass.c b/drivers/video/display-uclass.c
index 5d6f0c1..068108e 100644
--- a/drivers/video/display-uclass.c
+++ b/drivers/video/display-uclass.c
@@ -31,7 +31,7 @@
 	if (ret)
 		return ret;
 
-	disp_uc_plat = dev_get_uclass_platdata(dev);
+	disp_uc_plat = dev_get_uclass_plat(dev);
 	disp_uc_plat->in_use = true;
 
 	return 0;
@@ -71,7 +71,7 @@
 
 bool display_in_use(struct udevice *dev)
 {
-	struct display_plat *disp_uc_plat = dev_get_uclass_platdata(dev);
+	struct display_plat *disp_uc_plat = dev_get_uclass_plat(dev);
 
 	return disp_uc_plat->in_use;
 }
@@ -79,5 +79,5 @@
 UCLASS_DRIVER(display) = {
 	.id		= UCLASS_DISPLAY,
 	.name		= "display",
-	.per_device_platdata_auto	= sizeof(struct display_plat),
+	.per_device_plat_auto	= sizeof(struct display_plat),
 };