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/tools/Makefile b/tools/Makefile
index e8e1d27..af6a710 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -312,7 +312,7 @@
 $(LOGO_H):	$(obj)/bmp_logo $(LOGO_BMP)
 	$(obj)/bmp_logo --gen-info $(LOGO_BMP) > $@
 
-ifeq ($(CONFIG_DM_VIDEO),y)
+ifeq ($(CONFIG_VIDEO),y)
 $(LOGO_DATA_H):	$(obj)/bmp_logo $(LOGO_BMP)
 	$(obj)/bmp_logo --gen-bmp $(LOGO_BMP) > $@
 else