TBD, but there is nothing magic about RISC-V that would make this possible if it wasn't already possible with ARM. Apple has even done it with ARM, but to date no one else has. And if someone else did, it wouldn't really matter to AMD if it was RISC-V or ARM.
>neither of which RISC-V would do any time soon.
The latter, maybe.
The former, as soon as 2024 (e.g. Tenstorrent Ascalon)