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/stm32/stm32_ltdc.c b/drivers/video/stm32/stm32_ltdc.c
index ff28bdb..dc10b8c 100644
--- a/drivers/video/stm32/stm32_ltdc.c
+++ b/drivers/video/stm32/stm32_ltdc.c
@@ -329,7 +329,7 @@
 
 static int stm32_ltdc_probe(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);
 	struct video_priv *uc_priv = dev_get_uclass_priv(dev);
 	struct stm32_ltdc_priv *priv = dev_get_priv(dev);
 	struct udevice *bridge = NULL;
@@ -452,7 +452,7 @@
 
 static int stm32_ltdc_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);
 
 	uc_plat->size = CONFIG_VIDEO_STM32_MAX_XRES *
 			CONFIG_VIDEO_STM32_MAX_YRES *