Merge branch 'Xilinx-axienet-updates'

Robert Hancock says:

====================
Xilinx axienet updates

Updates to the Xilinx AXI Ethernet driver to add support for an additional
ethtool operation, and to support dynamic switching between 1000BaseX and
SGMII interface modes.
====================

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