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 419561b, 25b049e