This instruction is incorrectly categorized as the same one as
`aes64ks1i` and `aes64ks2` (that should require `zkne || zknd` but
currently require `zkne && zknd`) but `aes64im` only requires
the Zknd extension.
This commit fixes the category of this intrinsic (lowering the
requirements from the Rust perspective but it does not actually lower
it from the RISC-V perspective).
e54cc43867