drm/i915: Remove unused mode_fixup() vfunc of struct intel_dvo_dev_ops

It's totally unused, so remove the last mode_fixup appearance in i915.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --cc drivers/gpu/drm/i915/dvo.h
Simple merge

diff --cc drivers/gpu/drm/i915/intel_dvo.c
Simple merge

diff --cc drivers/gpu/drm/i915/intel_sdvo.c
Simple merge