- point on all ports (with and without LPDC support) to the global
  LPDC structure, this is so that all ports can see whether the LPDC
  ports were all calibrated
- add new state to tx_setup FSM in which ports wait for all the
  LPDC-supported ports to finish calibration

All ports (with and without support) need to wait for LPDC calibartion
to finish because otherwise one of them could become slave and
change the timing_mode while LPDC requires the switch to be in
free-running master mode