This follows update of the top in: top/spec_1_1/wr_streamers_demo
that is used by this testbench. After the updated of the top, few
changes were needed in the simulation:
- update of inputs/outputs in the main
- addition of a (dummy) synthesis_description.vhd (this is generated
  when synthesising, yet needed for compilation in simulation. Since,
  the data in this file is not really important in simulation, no
  need for generation of the file, dummy version is OK
- waveform updated