Need to enable Crypto extensions in ImperasDV imperas.ic

Created by: davidharrishmc

Test with

wsim rv64gc sha256sig1-01.S_ref.elf --elf /home/harris/cvw/tests/riscof/work/riscv-arch-test/rv64i_m/K/src/sha256sig1-01.S/ref/ref.elf --lockstep