[HW][LTL][SV] Unify EventControl

[maerhart]

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So, I've taken a closer look at this again following the discussion in #7022 and it turns out that there were CMake options added to support this for types and attributes (see -attrdefs-dialect <DialectName>) but not for enums. Probably the most elegant solution would be to add something similar upstream for enums, but this draft shows an alternative workaround solution.