wr_gthe3_phy_family7: assert rx_enc_err when the link is down to reliably force link down event in the PCS

wr_board_pkg: declare eb_ethernet_slave as a component so that compiler doesn't complain when EB repo is not included

Compilation and synthesis run at any new push. Simulation run according
to CI schedule configured on OHWR.

upgrade clbv3_ref_design to VIVADO clbv3_ref_design: add valid xdc and bmm file; use generic g_direct_dmtd

add wrpc/wrc_phy16_direct_dmtd.bram (spll KP parameters times 5 due to VCXOs range 20 ppm, incremented mode master lock timeout)
wrc_phy16_direct_dmtd.bram build with:
wrpc-sw.git peter_direct_dmtd SHA 50f1c0e
ppsi.git peter_direct_dmtd SHA bf5f6de

- Add generic parameter for the SDB info of the auxiliary interface of the WRPC.
- Export pps_csync and pps_valid ports from the WRPC.

wr_nic_wrapper: Fix copyright issues.

Fix a place & route error related to the OBUF used for PPS output signal.

It's used only locally in dmtd sampler. We don't have enough global
clock nets in Virtex6 for 18-port version of WRS.