🐛 fix #626
Created by: davideschiavone
This should fix #626 (closed) and add the randomness in the grant bus as suggested by @Silabs-ArjanB
in #625 .
I copied from https://github.com/openhwgroup/core-v-verif/pull/486/commits/ca1181d2b4f8ea36dfaf457d941db6ffdc1305eb