This patch afixes several driver bugs
* Make the windows disabled by default at module load and unload
* Enable the attribute window
* Change the order of the windows, now osd0 is fb0, so the video mode change
  must be done on vid0 which is fb1
* Remove more unsued code
* Make the enable_digital output to not change the window configurations
* Add a new ioctl to enable color bar test mode
* Fix some of the rules of the check_var function, now the virtual size of the
  window is handled automatic based on the 32 bytes align constraints