SUNRPC: Switch Camellia decrypt to crypto/krb5

The Camellia enctypes (RFC 6803) use the same MtE authenticated
encryption construction as AES-SHA1 (RFC 3962), implemented in
crypto/krb5 by the rfc3961_simplified profile. The encrypt path
already uses gss_krb5_aead_encrypt() for Camellia, but the decrypt
path was left on the old gss_krb5_aes_decrypt() code when the AES
enctypes were migrated.

Switch the Camellia .decrypt callback to gss_krb5_aead_decrypt() to
complete the AEAD migration for all enctypes. The conf_len and
cksum_len values in crypto/krb5's Camellia enctype descriptors match
the block size and checksum length that gss_krb5_aes_decrypt() was
using, so the headskip and tailskip returned to the unwrap layer are
unchanged.

Assisted-by: Claude:claude-opus-4-6
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Anna Schumaker <anna.schumaker@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

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