On Fujitsu-Siememens S6010 the ns2501 chip is hooked up to DVOB instead
of DVOC.

FIXME: Maybe need to dig out the correct DVO port from VBT
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Tested-by: NThomas Richter <richter@rus.uni-stuttgart.de>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>