Fix various verilator related problems in the testbenches
Created by: bluewww
- Move verilator-model to tb/ directory and adjust Makefile
- Add -Wno-BLKANDNBLK to disable warning This allow us to use the PULP_SECURE=1 code path
- Add missing fpnew dependency to verilator-model makefile
Fixes #72 (closed) Related #141 (closed)