drm/i915: Remove bogus DDI-F from hsw/bdw output init

HSW/BDW don't have DDI-F so don't go looking for one.

Seems to have been accidentally left behind when the
skl+ stuff got split out in commit 097d9e90
("drm/i915/display: remove strap checks from gen 9").

Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230616140820.11726-2-ville.syrjala@linux.intel.com