Merge branch 'r8169-add-EEE-support-for-RTL8168g+'

Heiner Kallweit says:

====================
r8169: add EEE support for RTL8168g+

This series adds general EEE support to be used with ethtool.
In addition it implements EEE for chip versions from RTL8168g.
The first patch leaves the default chip settings and the
second enables EEE per default. This allows us to revert patch 2
w/o removing EEE support completely if we should face issues with
EEE on particular chip versions.

Unfortunately Realtek decided not to use the standard EEE MMD
registers but to use proprietary registers. Therefore we can't
use phylib functions like phy_ethtool_set_eee and have to
reimplement the functionality.

Tested on a system with RTL8168g (chip version 40).
====================

Signed-off-by: David S. Miller <davem@davemloft.net>