crypto: x86/aesni - remove unused internal cipher algorithm

Since commit 944585a6 ("crypto: x86/aes-ni - remove special handling
of AES in PCBC mode"), the "__aes-aesni" internal cipher algorithm is no
longer used.  So remove it too.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>