drm/i915: remove redundant ELD connector type update

drm_edid_to_eld() sets ELD connector type since commit 1d1c3665
("drm/edid: set ELD connector type in drm_edid_to_eld()"). Remove the
redundant update.

(Commit c945b8c1 ("drm/edid: build ELD in drm_add_edid_modes()") and
commit d471ed04 ("drm/drivers: drop redundant drm_edid_to_eld()
calls") are also related.)

v2: Rebase, update commit message with commit references.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171229125547.28672-1-jani.nikula@intel.com