scalar-crypto: post arch-review aes32* opcode change

- After questions from the architecture review and subsequent cryptography
  task group meetings, we have stopped overlapping the aes32* and aes64*
  instruction encodings.

- We've done this in the name of removing complexity, because opcode space is
  not as tight as we thought it was when we originally overlapped them.

- Change affected by updating the aes32* opcodes only.

 On branch master
 Your branch is up-to-date with 'origin/master'.

 Changes to be committed:
	modified:   opcodes-rv32k
	modified:   parse_opcodes