Merge "Enable flow control when tx buffer is full and peer stuck in receiving" into lmp-dev

        /* if we're over buffer high water mark, we're done */

        if ((p_port->tx.queue_size  > PORT_TX_HIGH_WM)

         || (p_port->tx.queue.count > PORT_TX_BUF_HIGH_WM))

        {

            port_flow_control_user(p_port);

            event |= PORT_EV_FC;

            debug("tx queue is full,tx.queue_size:%d,tx.queue.count:%d,available:%d",

                    p_port->tx.queue_size, p_port->tx.queue.count, available);

            break;

         }

        /* continue with rfcomm data write */

        p_buf = (BT_HDR *)GKI_getpoolbuf (RFCOMM_DATA_POOL_ID);