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/lib/efi_loader/efi_console.c b/lib/efi_loader/efi_console.c
index ab83f8b..4d08dd3 100644
--- a/lib/efi_loader/efi_console.c
+++ b/lib/efi_loader/efi_console.c
@@ -353,7 +353,7 @@
 	int rows = 25, cols = 80;
 	int ret = -ENODEV;
 
-	if (IS_ENABLED(CONFIG_DM_VIDEO))
+	if (IS_ENABLED(CONFIG_VIDEO))
 		ret = query_vidconsole(&rows, &cols);
 	if (ret)
 		ret = query_console_serial(&rows, &cols);