Patch for issue #52

Created by: sjthales

I just modified two files cv32/tests/core/Makefile and cv32/tests/core/firmware/start.S if you want to run all test with questa, you can write : make questa-all if you want to run a specific test, for instance add test, you can write : make questa-unit-test add It is the same thing for compliance riscv, to run I_LBU_01 : make questa-unit-test I_LBU_01 It works on my side.