Add ifdef for VCS fix (UNSUPPORTED_WITH)
Created by: CoralieAllioux
This fix is suggested in the context of supporting Cadence Xcelium simulator for cva6 verification.
There is a VCS bug which does not support correctly the difference between with
and iff
keywords. A missing define needs to be added in order to allow xcelium to compile.
This has been check with VCS 2021.09.