Add OP-V and OP-P to base opcode map

[a4lg]

"V" extension corresponding new base opcode OP-V (0b1010111) is now ratified and opcode using OP-P (0b1110111) is approved for the vector cryptography extensions.

This PR reflects new base opcodes.

Note that OP-V part is an AsciiDoc port of #862.
OP-P part is new in this PR (I didn't notice at the first time but vector cryptography extensions use instructions with OP-P).

[Nelson1225]

Seems like OP_V and OP_P haven't been updated in the spec, they are still reserved. However, OP_V was already used for vector in the binutils. So it would great if spec can clarify 0x57 is OP_V, and 0x77 is OP_P :-)

[a4lg]

Reference: Vector Crypto Specification (v1.0.0-rc2)

Appendix A: Crypto Vector Cryptographic Instructions
OP-P (0x77) Crypto Vector instructions except Zvbb and Zvbc

lists 21 instructions (with 11 funct6 values) with OP-P.

[a4lg]

@aswaterman
Reminder and a question.
Should I separate OP-P changes to avoid arguments of P/V allocation? I thought using the name OP-P is already approved because (near ratification) vector cryptography documentation uses OP-P... but tell me if not.

[aswaterman]

Yeah, I don't want to accept this PR as-is, but I can accept a PR that adds only OP-V.

[a4lg]

Understood. I'll keep this open but make a plain port of #862.

[aswaterman]

I'm going to close this with the expectation something similar will be reopened once a P spec is closer to the finish line.