add macro for disable video component

Change-Id: I7569bda5b210efb623782955040f1c0d2ecae76d

config/subsystem/graphic/config.gni

@@ -16,4 +16,5 @@
 declare_args() {
   enable_graphic_font = false
   enable_graphic_dualcore = false
+  enable_video_component = false
 }