missing arch detection for AMD zen5 architecture

[lexming]

We want to use native binaries on our zen5 systems, but there is no detection for that platform. Although it seem that EESSI already ships those binaries.

[ocaisa]

That was held back in #162 for a while as we saw quite some differences reported for CPU features by different platforms.

[boegel]

@bedroge Can you follow up on this?

[bedroge]

@bedroge Can you follow up on this?

I've made a (internal) proposal in https://gitlab.com/eessi/support/-/work_items/244, we can maybe discuss it in tomorrow's support meeting.