Added cv32e40p wrapper

Created by: davideschiavone

This file instatiates both the core and the tracer as it was before. Users that want to use the tracer should simply replace in their system the core_i instantiation with the wrapper_i one.

I also suggest that the core-verif repository uses such wrapper to avoid dealing with the core internal signals, otheriwse any internal modification of the core must be ported to the core-verif and any other system that uses the tracer.

The bhv/cv32e40p_wrapper must be supported as much as any other cv32e40p rtl file.