drm/edid: remove redundant _drm_connector_update_edid_property()

Realize that drm_edid_connector_update() and
_drm_connector_update_edid_property() are now the same thing. Drop the
latter.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/712cc299afe33d8f6279a15d5b0117aeeab88bb4.1674144945.git.jani.nikula@intel.com