[coreboot] text-mode graphics on gm45

[The Gluglug]

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When text-mode graphics (disable "Keep VESA Framebuffer") is
selected, backlight turns on at payload stage (GRUB tested) but
no graphics are shown (black screen). Graphics do work after payload
stage, when booting a GNU/Linux distribution.
(tested on X200).

I attempted a fix, but still couldn't get it to work (non-working
patch here: http://review.coreboot.org/#/c/8018/)

What am I doing wrong?
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