Merge from CV32E40X
Created by: silabs-oysteink
Cherry picked PR merge containing mstateen CSRs.
Merge pull request #565 from silabs-oysteink/silabs-oysteink_rvfi-csr-stateen
Added Smstateen CSRs to RVFI (only supported in cv32e40s)
Signed-off-by: Oystein Knauserud Oystein.Knauserud@silabs.com