dm: treewide: Rename ..._platdata variables to just ..._plat

Try to maintain some consistency between these variables by using _plat as
a suffix for them.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/broadwell_igd.c b/drivers/video/broadwell_igd.c
index 8e5c6cf..cba105c 100644
--- a/drivers/video/broadwell_igd.c
+++ b/drivers/video/broadwell_igd.c
@@ -661,7 +661,7 @@
 
 static int broadwell_igd_probe(struct udevice *dev)
 {
-	struct video_uc_platdata *plat = dev_get_uclass_plat(dev);
+	struct video_uc_plat *plat = dev_get_uclass_plat(dev);
 	struct video_priv *uc_priv = dev_get_uclass_priv(dev);
 	bool is_broadwell;
 	ulong fbbase;
@@ -756,7 +756,7 @@
 
 static int broadwell_igd_bind(struct udevice *dev)
 {
-	struct video_uc_platdata *uc_plat = dev_get_uclass_plat(dev);
+	struct video_uc_plat *uc_plat = dev_get_uclass_plat(dev);
 
 	/* Set the maximum supported resolution */
 	uc_plat->size = 2560 * 1600 * 4;