lib/crypto: x86/aes: Clean up aes-aesni.S in preparation for AES modes

Various miscellaneous updates to the assembly code in preparation for
adding implementations of AES modes to the same file:

- Define macros for the function argument registers, function prologues,
  and function epilogues to centralize some of the handling of 32-bit vs
  64-bit.

- Refactor the actual AES encryption and AES decryption logic into
  macros _do_aes and _do_aes_ecb so that some of the modes can reuse it.

- Rename mask to expandkey_mask to differentiate it from the bswap_mask
  that will be added.

- Update the prototypes of aes_encrypt_aesni() and aes_decrypt_aesni()
  to be dst, src, key so that they will match the mode functions.

  Note that this means passing a pointer to the key struct instead of a
  (nrounds, rndkeys) pair, similar to what arch/x86/crypto/aes*.S do.
  Although this makes the assembly code depend on the format of the key
  struct, having one fewer argument makes it easier to accommodate
  32-bit mode, and the C glue code becomes slightly simpler.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://patch.msgid.link/20260927224418.109759-4-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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