drm/i915/dvo: Introduce intel_dvo_connector_type()

Introduce intel_dvo_connector_type() as a counterpart to
intel_dvo_encoder_type(), mainly to declutter intel_dvo_init()
a bit.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221118105525.27254-5-ville.syrjala@linux.intel.com


Reviewed-by: Jani Nikula <jani.nikula@intel.com>