[PATCH] i915: Add option to bypass vbt table.

[Mathias Fröhlich]

Hi,

Attached is a small change to i915 that fixes a customer case that I had in my 
day job.

The problem happens with an embedded board that contains vbt bios tables that 
do not match the attached display.
Using this change and the apropriate kernel boot command line they are able to 
use an otherwise completely unusable secondary display on that embedded board.

Please review.

Thanks!

Mathias