fixed mms_dp_gain_serial_arr latency

...ications/lofar2/libraries/sdp/src/vhdl/sdp_bf_weights.vhd

...s/lofar2/libraries/sdp/src/vhdl/sdp_subband_equalizer.vhd

libraries/base/dp/src/vhdl/mms_dp_gain_serial_arr.vhd