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/include/configs/sunxi-common.h b/include/configs/sunxi-common.h
index fe90d55..12666b7 100644
--- a/include/configs/sunxi-common.h
+++ b/include/configs/sunxi-common.h
@@ -301,7 +301,7 @@
 	"stdin=serial\0"
 #endif
 
-#ifdef CONFIG_DM_VIDEO
+#ifdef CONFIG_VIDEO
 #define CONSOLE_STDOUT_SETTINGS \
 	"stdout=serial,vidconsole\0" \
 	"stderr=serial,vidconsole\0"