Merge - "x/dev"

Created by: silabs-robin

This PR fetches the current state of core-v-verif's cv32e40x/dev into this new x-dv repo. (Preparing for the demise of cv32e40x/dev.)

How to test:

1. git clone git@github.com:openhwgroup/core-v-verif.git.
2. cd core-v-verif && git checkout cv32e40s/dev (note, using 40s/dev)
3. CV_CORE=cv32e40x VERIF_ENV_REPO=git@github.com:silabs-robin/cv32e40x-dv.git VERIF_ENV_BRANCH=cv32e40xdev_subtree ./bin/clonetb --clone
4. (Run whatever tests you like.)