net: atlantic: fix missing | operator when assigning rec->llc

rec->llc is currently being assigned twice, once with the lower 8 bits
from packed_record[8] and then re-assigned afterwards with data from
packed_record[9].  This looks like a type, I believe the second assignment
should be using the |= operator rather than a direct assignment.

Addresses-Coverity: ("Unused value")
Fixes: b8f8a0b7

 ("net: atlantic: MACSec ingress offload HW bindings")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Igor Russkikh <irusskikh@marell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>