net: mii: Report advertised link capabilities when autonegotiation is off

Unify the set of information returned by mii_ethtool_get_link_ksettings(),
mii_ethtool_gset() and phy_ethtool_ksettings_get(). Make the mii_*()
functions report advertised settings when autonegotiation if disabled.

Suggested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Łukasz Stelmach <l.stelmach@samsung.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20201027114317.8259-1-l.stelmach@samsung.com


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