bnx2x: Fix the behavior of ethtool when ONBOOT=no

This is the same fix as commit
7959ea25 ("bnx2: Fix the behavior of
ethtool when ONBOOT=no"), but for bnx2x:

--------------------
    When configure in ifcfg-eth* is ONBOOT=no,
    the behavior of ethtool command is wrong.
    
        # grep ONBOOT /etc/sysconfig/network-scripts/ifcfg-eth2
        ONBOOT=no
        # ethtool eth2 | tail -n1
                Link detected: yes
    
    I think "Link detected" should be "no".
--------------------

Signed-off-by: Naohiro Ooiwa <nooiwa@miraclelinux.com>
Acked-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>