Add and use sdp_crosslets_remote_v2.vhd.

applications/lofar2/libraries/sdp/hdllib.cfg

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

...lofar2/libraries/sdp/src/vhdl/sdp_crosslets_remote_v2.vhd