Some clean up of sdp_station.vhd and fifo fill eop usage
Use c_nof_beamlets_per_data = c_sdp_cep_nof_beamlets_per_longword = 2 dual pol beamlets per 64b data word.
Closes L2SDP-776
Use c_nof_beamlets_per_data = c_sdp_cep_nof_beamlets_per_longword = 2 dual pol beamlets per 64b data word.
Closes L2SDP-776