lib/crypto: x86/aes-xts: Migrate AVX-optimized code into library

Migrate aes-xts-avx-x86_64.S into lib/crypto/, wiring it up to the XTS
library functions instead of the crypto_skcipher API.  It still remains
available through crypto_skcipher via crypto/aes.c.

Some adjustments to the assembly code were needed:

- Take 'struct aes_key' instead of 'struct crypto_aes_ctx'.

- Remove the ciphertext stealing support from the assembly code, as the
  library implements it in a generic way instead.  (This does slightly
  reduce performance when the length isn't a multiple of 16 bytes;
  however, that case seems to never be reached in practice in the
  kernel.  So it makes sense to not extensively optimize for it yet.)

- Change 'int len' to 'long nblocks' for compatibility with the
  library's use of size_t lengths.

- Remove the CFI stubs, as the functions are now called directly.

- Adjust the argument order to match the caller.  Not strictly required,
  but it's easiest to handle this now when changing the function
  prototypes anyway and adding the new glue code.

This makes the remaining code in aesni-intel_asm.S (which just handled
key expansion) unused, so remove that too.

Don't remove the selection of CRYPTO_SKCIPHER from CRYPTO_AES_NI_INTEL
yet, since it's still needed for the "skcipher_walk" functions.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://patch.msgid.link/20260927224418.109759-15-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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