keys: Explicitly overlap struct asymmetric_key_id_data and struct asymmetric_key_id

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Signed-off-by: Kees Cook <kees@kernel.org>
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Cc: David Howells <dhowells@redhat.com>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Ignat Korchagin <ignat@cloudflare.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: <keyrings@vger.kernel.org>
Cc: <linux-crypto@vger.kernel.org>