netlink: specs: Fix pse-set command attributes

Not all PSE attributes are used for the pse-set netlink command.
Select only the ones used by ethtool.

Fixes: f8586411

 ("netlink: specs: Expand the pse netlink command with PoE interface")
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>