lib/crypto: aes: Add CBC and CBC-CTS support

Add support for AES-CBC and AES-CBC-CTS to the crypto library.

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

    - block/blk-crypto-fallback.c (for AES-128-CBC-ESSIV)
    - fs/crypto/crypto.c (for AES-128-CBC-ESSIV)
    - fs/crypto/fname.c (for AES-256-CTS and AES-128-CBC)
    - kernel/bpf/crypto.c
    - net/ceph/crypto.c
    - security/keys/encrypted-keys/encrypted.c

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

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/20260715221153.246410-4-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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