net/tcp-ao: Use crypto library API instead of crypto_ahash

Currently the kernel's TCP-AO implementation does the MAC and KDF
computations using the crypto_ahash API.  This API is inefficient and
difficult to use, and it has required extensive workarounds in the form
of per-CPU preallocated objects (tcp_sigpool) to work at all.

Let's use lib/crypto/ instead.  This means switching to straightforward
stack-allocated structures, virtually addressed buffers, and direct
function calls.  It also means removing quite a bit of error handling.
This makes TCP-AO quite a bit faster.

This also enables many additional cleanups, which later commits will
handle: removing tcp-sigpool, removing support for crypto_tfm cloning,
removing more error handling, and replacing more dynamically-allocated
buffers with stack buffers based on the now-statically-known limits.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Link: https://patch.msgid.link/20260427172727.9310-3-ebiggers@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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