Merge "HFP: Add missing sco listen action in state machine"

        case BTA_AG_RFC_OPEN_EVT:

          p_scb->state = BTA_AG_OPEN_ST;

          bta_ag_rfc_open(p_scb, data);

          bta_ag_sco_listen(p_scb, data);

          break;

        case BTA_AG_RFC_CLOSE_EVT:

          p_scb->state = BTA_AG_INIT_ST;