[display] Refactor to avoid implicit framebuffer allocation.

lib/gfxconsole/gfxconsole.c

 /*
  * Copyright (c) 2008-2010, 2015 Travis Geiselbrecht
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files
  * (the "Software"), to deal in the Software without restriction,
  * including without limitation the rights to use, copy, modify, merge,
  * publish, distribute, sublicense, and/or sell copies of the Software,
  * and to permit persons to whom the Software is furnished to do so,
  * subject to the following conditions:
@@ skipping 146 matching lines @@
  * @brief  Initialize graphics console on default display
  */
 void gfxconsole_start_on_display(void)
 {
     static bool started = false;
 
     if (started)
         return;
 
     /* pop up the console */
-    struct display_info info;
-    if (display_get_info(&info) < 0)
+    struct display_framebuffer fb;
+    if (display_get_framebuffer(&fb) < 0)
         return;
 
-    gfx_surface *s = gfx_create_surface_from_display(&info);
+    gfx_surface *s = gfx_create_surface_from_display(&fb);
     gfxconsole_start(s);
     started = true;
 }
 
 static void gfxconsole_init_hook(uint level)
 {
     gfxconsole_start_on_display();
 }
 
 LK_INIT_HOOK(gfxconsole, &gfxconsole_init_hook, LK_INIT_LEVEL_PLATFORM);