added option to restart wpfb using the in_sosi valid instead of the

...ons/lofar2/libraries/sdp/src/vhdl/node_sdp_filterbank.vhd

libraries/dsp/wpfb/src/vhdl/wpfb_unit_dev.vhd

libraries/dsp/wpfb/tb/vhdl/tb_wpfb_unit_dev.vhd

libraries/dsp/wpfb/tb/vhdl/tb_wpfb_unit_wide.vhd