Renamed c_sdp_reg_hdr_dat_addr_w into more precise c_sdp_reg_bf_hdr_dat_addr_w.

...unb2b_beamformer/src/vhdl/mmm_lofar2_unb2b_beamformer.vhd

...b2b_sdp_station/src/vhdl/mmm_lofar2_unb2b_sdp_station.vhd

...b2c_sdp_station/src/vhdl/mmm_lofar2_unb2c_sdp_station.vhd