Make consistent operand names

There are a few places where operand/field names are not consistent
across scattered definitions for an instruction.

Here, parameter `rs2` is used for encode/decode and execute, but
`rd` is used for the same purpose in the assembly clause:
```
mapping clause encdec_compressed = C_SWSP(ui76 @ ui52, rs2)
  <-> 0b110 @ ui52 : bits(4) @ ui76 : bits(2) @ rs2 : regidx @ 0b10

function clause execute (C_SWSP(uimm, rs2)) = {
  let imm : bits(12) = zero_extend(uimm @ 0b00);
  execute(STORE(imm, rs2, sp, WORD, false, false))
}

mapping clause assembly = C_SWSP(uimm, rd)
  <-> "c.swsp" ^ spc() ^ reg_name(rd) ^ sep() ^ hex_bits_6(uimm)
```

Fix these by using the operand names found in
"The RISC-V Instruction Set Manual, Volume I: Unprivileged ISA",
document version 20191213, and "RISC-V Cryptography Extensions
Volumn I: Scalar & Entropy Source Instructions", version v1.0.1.

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