Revert backlight patch for 2.6.28

[realKano at directbox.com]

This patch affects for example Dell Vostro laptops

http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-jaunty.git;a=commitdiff;h=e9c7dae04d7168ce7f3b823a1d7349e2212e29fb

It is impossible to use override options for the video module as you could guess from the launchpad entry. The only option the video module supports is:

parm:           brightness_switch_enabled:bool

So revert it and look for another fix.