net/ncsi: add get MAC address command to get Intel i210 MAC address

This patch adds OEM Intel GMA command and response handler for it.

Signed-off-by: Brad Ho <Brad_Ho@phoenix.com>
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Signed-off-by: Ivan Mikhaylov <i.mikhaylov@yadro.com>
Link: https://lore.kernel.org/r/20210830171806.119857-2-i.mikhaylov@yadro.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>