crypto: crypto4xx - wire up hmac_mc to hmac_muting

The hmac_mc parameter of set_dynamic_sa_command_1()
was defined but not used. On closer inspection it
turns out, it was never wired up.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>