Reduce log level for lane speed key construction failure (#549)

* Reduce log level for lane speed key construction failure

* Removed the lane speed key construction failure log completely as this key type is not mandatory for all vendors

sonic-xcvrd/xcvrd/xcvrd_utilities/media_settings_parser.py

@@ -78,9 +78,6 @@ def get_lane_speed_key(physical_port, port_speed, lane_count):
             host_electrical_interface_id = appl_adv_dict[app_id].get('host_electrical_interface_id')
             if host_electrical_interface_id:
                 lane_speed_key = LANE_SPEED_KEY_PREFIX + host_electrical_interface_id.split()[0]
-        if not lane_speed_key:
-            helper_logger.log_error("No host_electrical_interface_id found for CMIS module on physical port {}"
-                                    ", failed to construct lane_speed_key".format(physical_port))
     else:
         # Directly calculate lane speed and use it as key, this is especially useful for
         # non-CMIS transceivers which typically have no host_electrical_interface_id