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.