drm/i915: only apply crt_present check on VLV
Apparently we can't trust this field on other platforms and need to find
some other way.
This fixes a regression introduced in
commit
24a2743772e07c5d9aed57d36cbd82994f4d2453
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date: Fri Apr 4 16:12:07 2014 -0700
drm/i915: use VBT to determine whether to enumerate the VGA port
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Tested-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>