compat: backplane mode negotiation ethtool definitions

compat: backplane mode negotiation ethtool definitions

This backports the ethtool definitions implemented on
commit 894b19a6.

mcgrof@frijol ~/linux-next (git::master)$ git describe --contains 894b19a6
v2.6.31-rc1~14^2~577

commit 894b19a6b343ce3589237167a56e6df0fe72ef0d
Author: Ben Hutchings <bhutchings@solarflare.com>
Date:   Wed Apr 29 08:25:57 2009 +0000

    ethtool/mdio: Support backplane mode negotiation

    Compile-tested only.

    Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>