ixgbe: support for ethtool set_rxfh

Allows to change the rxfh indirection table and/or key using
ethtool interface.

Signed-off-by: Tom Barbette <tom.barbette@ulg.ac.be>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --cc drivers/net/ethernet/intel/ixgbe/ixgbe.h
Simple merge

diff --cc drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
Simple merge

diff --cc drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
Simple merge