lib/crypto: aes: Add CTR and XCTR support

Add support for AES-CTR and AES-XCTR to the crypto library.

These will be used to provide streamlined implementations of the
"ctr(aes)" and "xctr(aes)" crypto_skcipher algorithms.  Most users of
"ctr(aes)" will also be able to switch to the library, which as usual
will be simpler and faster, e.g.:

  - net/mac80211/fils_aead.c
  - net/mac802154/llsec.c

As usual, the architecture-optimized AES-CTR and AES-XCTR code will be
migrated into the library as well (using the hooks provided in this
commit), eliminating lots of repetitive boilerplate code.

This is also a prerequisite for supporting AES-GCM, AES-CCM, and
AES-HCTR2 in the crypto library.

Initial test coverage is provided by the crypto_skcipher support added
in a later commit.  I'm planning a KUnit test suite as well.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Link: https://patch.msgid.link/20260715221153.246410-5-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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