drm/edid/quirks: ViewSonic VA2026w

Entirely new class of fail for this one.  The detailed timings are for
normal CVT but the monitor really wanted CVT-R.

Bugzilla: http://bugzilla.redhat/com/516471


Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>