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/tegra.c b/drivers/video/tegra.c
index d185096..08b006b 100644
--- a/drivers/video/tegra.c
+++ b/drivers/video/tegra.c
@@ -299,7 +299,7 @@
 
 static int tegra_lcd_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);
 	struct tegra_lcd_priv *priv = dev_get_priv(dev);
 	const void *blob = gd->fdt_blob;
@@ -393,7 +393,7 @@
 
 static int tegra_lcd_bind(struct udevice *dev)
 {
-	struct video_uc_platdata *plat = dev_get_uclass_plat(dev);
+	struct video_uc_plat *plat = dev_get_uclass_plat(dev);
 	const void *blob = gd->fdt_blob;
 	int node = dev_of_offset(dev);
 	int rgb;