drivers/intel/gma: Add override for presence straps

A handful of boards do not properly implement the presence straps,
leading libgfxinit to fail to detect an attached display. Add an
override, defaulting to N, which can be set for affected boards.

Add a section to the documentation detailing the option and its usage.

Signed-off-by: Matt DeVillier <matt.devillier@puri.sm>
Change-Id: I43c61d67147878887658b23d90fb1c0b91e7a2af
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41416
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

0 files changed, 0 insertions, 0 deletions