crypto: aes - Add GCM support using library

Implement the "gcm(aes)" and "rfc4106(gcm(aes))" crypto_aead algorithms
using the corresponding library functions.

Among other benefits, this allows the architecture-optimized AES-GCM
code to be migrated into the library while still leaving it accessible
via crypto_aead, 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/20260715221153.246410-13-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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