[RISCV] Don't require specific extensions to use altfmt with vset(i)vli. (#202458) The list of extensions that use altfmt is increasing and is becoming unsustainable. The likelihood of the bit being repurposed is decreasing with each new use. Let's just allow it unconditionally. There is some risk here since all of these extensions are still unratified and experimental so it could be that all of these extensions get redefined so that this bit doesn't become altfmt. But I think that's unlikely.
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