feed missing sedes and SFP signals to wrpc hdl
Adding tx_prbs_sel, tx_locked, sfp_tx_disable, sfp_loss,
sfp_tx_fault and full width loopen signals to the WRPC HDL module.
This provides more possibilities for loopback (near-end, far-end),
turning off/on SFP, etc.
Done with commits 419561be, 25b049e4