video: Rename CONFIG_DM_VIDEO to CONFIG_VIDEO

Now that all the old code is gone, rename this option. Driver model
migration is now complete.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/atmel/sama5d4_xplained/sama5d4_xplained.c b/board/atmel/sama5d4_xplained/sama5d4_xplained.c
index 9fb7e6f..4058594 100644
--- a/board/atmel/sama5d4_xplained/sama5d4_xplained.c
+++ b/board/atmel/sama5d4_xplained/sama5d4_xplained.c
@@ -76,7 +76,7 @@
 int board_late_init(void)
 {
 	at91_pda_detect();
-#ifdef CONFIG_DM_VIDEO
+#ifdef CONFIG_VIDEO
 	at91_video_show_board_info();
 #endif
 	return 0;