Corrected PIO_WDI into REG_WDI.

...ofar2/designs/lofar2_unb2b_adc/lofar2_unb2b_adc.fpga.yaml

...lofar2_unb2b_beamformer/lofar2_unb2b_beamformer.fpga.yaml

...lofar2_unb2b_filterbank/lofar2_unb2b_filterbank.fpga.yaml

...far2_unb2b_sdp_station/lofar2_unb2b_sdp_station.fpga.yaml

.../uniboard2b/designs/unb2b_minimal/unb2b_minimal.fpga.yaml