crypto: aes - Add CTR and XCTR support using library

Implement the "ctr(aes)" and "xctr(aes)" crypto_skcipher algorithms
using the corresponding library functions.

Among other benefits, this allows the architecture-optimized AES-CTR and
AES-XCTR code to be migrated into the library while still leaving it
accessible via crypto_skcipher, eliminating lots of boilerplate code.

For now the cra_priority is set to just 110, since the
architecture-optimized implementations of these algorithms haven't yet
been migrated into the library.  It will be boosted once that happens.

Link: https://patch.msgid.link/20260715221153.246410-11-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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