nvme-auth: host: use crypto library in nvme_auth_dhchap_setup_host_response()

nvme-auth: host: use crypto library in nvme_auth_dhchap_setup_host_response()

For the HMAC computation in nvme_auth_dhchap_setup_host_response(), use
the crypto library instead of crypto_shash.  This is simpler, faster,
and more reliable.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Keith Busch <kbusch@kernel.org>