lib/crypto: x86/aes-ctr: Add AES-NI optimization

Optimize the crypto library's AES-CTR support with AES-NI, bringing its
performance on par with the "ctr-aes-aesni" skcipher algorithm it will
supersede.

The new assembly function is written from scratch to fit well into the
crypto library and to be more consistent with aes-ctr-avx-x86_64.S than
the code in arch/x86/crypto/aesni-intel_asm.S that it will supersede.
That includes using the "ctr64" convention, where the assembly code is
simplified by making the C code handle incrementing the high 64 bits of
the counter.  Unlike the ECB, CBC, and XTS code, 32-bit support is *not*
included for this one, as the existing CTR code didn't have it.

Note: the priority of ctr-aes-lib is left unchanged at 110 temporarily.
It will be increased when the AVX-optimized code is migrated too.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://patch.msgid.link/20260927224418.109759-7-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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