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>

arch/arm/mach-stm32mp/cmd_stm32prog/cmd_stm32prog.c

@@ -79,7 +79,7 @@ static int do_stm32prog(struct cmd_tbl *cmdtp, int flag, int argc,
 		}
 	}
 
-	if (IS_ENABLED(CONFIG_DM_VIDEO))
+	if (IS_ENABLED(CONFIG_VIDEO))
 		enable_vidconsole();
 
 	data = (struct stm32prog_data *)malloc(sizeof(*data));