crypto: aes - Add XTS support using library

Implement the "xts(aes)" crypto_skcipher algorithm using the
corresponding library functions.

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

Fast paths similar to what x86_64 uses (to eliminate the scatterlist
walking overhead) are included.  So we'll get that optimization for all
architectures.

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

Link: https://patch.msgid.link/20260715221153.246410-12-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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