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/mvebu_lcd.c b/drivers/video/mvebu_lcd.c
index bc789ec..d3d07e5 100644
--- a/drivers/video/mvebu_lcd.c
+++ b/drivers/video/mvebu_lcd.c
@@ -526,7 +526,7 @@
 
 static int mvebu_video_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 mvebu_video_priv *priv = dev_get_priv(dev);
 	struct mvebu_lcd_info lcd_info;
@@ -575,7 +575,7 @@
 
 static int mvebu_video_bind(struct udevice *dev)
 {
-	struct video_uc_platdata *plat = dev_get_uclass_plat(dev);
+	struct video_uc_plat *plat = dev_get_uclass_plat(dev);
 
 	plat->size = LCD_MAX_WIDTH * LCD_MAX_HEIGHT *
 		(1 << LCD_MAX_LOG2_BPP) / 8;