[portsorch]: Remove SAI_PORT_ATTR_BIND_MODE (sonic-net#262)

This attribute is removed in the SAI master.
Port can be part of .1D bridge and VLANs at the same time. Hence
bind mode is not necessary.

orchagent/portsorch.cpp

@@ -1181,20 +1181,6 @@ bool PortsOrch::addVlanMember(Port vlan, Port port, string& tagging_mode)
         SWSS_LOG_NOTICE("Set untagged port %s VLAN ID to %hu", port.m_alias.c_str(), vlan.m_vlan_id);
     }
 
-#if 0
-    // Set port bind mode
-    sai_attribute_t port_attr;
-    port_attr.id = SAI_PORT_ATTR_BIND_MODE;
-    port_attr.value.s32 = SAI_PORT_BIND_MODE_PORT;
-    status = sai_port_api->set_port_attribute(port.m_port_id, &port_attr);
-    if (status != SAI_STATUS_SUCCESS)
-    {
-        SWSS_LOG_ERROR("Failed to set port pid:%lx bind mode to port: %d",
-                port.m_port_id, status);
-        return false;
-    }
-#endif
-
     port.m_vlan_id = vlan.m_vlan_id;
     port.m_port_vlan_id = vlan.m_vlan_id;
     port.m_vlan_member_id = vlan_member_id;