enic: add support for set/get rss hash key

This patch adds support for setting/getting rss hash key using ethtool.

v2:
respin patch to support RSS hash function changes.

Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/ethernet/cisco/enic/enic.h
Simple merge

diff --cc drivers/net/ethernet/cisco/enic/enic_ethtool.c
Simple merge

diff --cc drivers/net/ethernet/cisco/enic/enic_main.c
Simple merge