Add HWLoops tests and improved cv_regress script for tb build without ISS
Created by: pascalgouedo
- Updated march option with respect to names, zfinx and added hwloops compatible with 20230310 Embecosm toolchain (except zfinx).
- Added 2 new XPULP Hardware Loop assembly tests.
- Updated cv_regress and template to allow tb compilation without ISS.