Don't provide FCoE and iSCSI statistics to management firmware if
CONFIG_CNIC is not set.  Some needed structure fields are not defined
without CONFIG_CNIC.
Reported-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NMichael Chan <mchan@broadcom.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>