net/ncsi: add NCSI Intel OEM command to keep PHY up

[ Upstream commit abd2fddc ]

This allows to keep PHY link up and prevents any channel resets during
the host load.

It is KEEP_PHY_LINK_UP option(Veto bit) in i210 datasheet which
block PHY reset and power state changes.

Signed-off-by: Ivan Mikhaylov <i.mikhaylov@yadro.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: e85e271d ("net/ncsi: Fix the multi thread manner of NCSI driver")
Signed-off-by: Sasha Levin <sashal@kernel.org>