SMP does ECB crypto on stack buffers.  This is complicated and
fragile, and it will not work if the stack is virtually allocated.

Switch to the crypto_cipher interface, which is simpler and safer.
Signed-off-by: NAndy Lutomirski <luto@kernel.org>
Acked-by: NHerbert Xu <herbert@gondor.apana.org.au>
Acked-by: NJohan Hedberg <johan.hedberg@intel.com>
Tested-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>