video: Drop DEV_FLAGS_SYSTEM flag

DEV_FLAGS_SYSTEM does not have any actual meaning, hence drop it.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/common/cmd_console.c b/common/cmd_console.c
index 93dc505..9a356ec 100644
--- a/common/cmd_console.c
+++ b/common/cmd_console.c
@@ -27,10 +27,9 @@
 	list_for_each(pos, list) {
 		dev = list_entry(pos, struct stdio_dev, list);
 
-		printf ("%-8s %08x %c%c%c ",
+		printf ("%-8s %08x %c%c ",
 			dev->name,
 			dev->flags,
-			(dev->flags & DEV_FLAGS_SYSTEM) ? 'S' : '.',
 			(dev->flags & DEV_FLAGS_INPUT) ? 'I' : '.',
 			(dev->flags & DEV_FLAGS_OUTPUT) ? 'O' : '.');