net: ethernet: ti: cpsw: disable PHY EEE advertisement

It seems the cpsw MAC doesn't support EEE. See e.g. the commit message of
ce2899428ec0 ("ARM: dts: am335x-baltos: disable EEE for Atheros 8035 PHY").
There are cases where this causes issues if the PHY's on both sides have
negotiated EEE. As a workaround EEE modes of the PHY are marked broken
in DT, effectively disabling EEE advertisement.
Improve this by using new function phy_disable_eee() in the MAC driver.
This properly disables EEE advertisement, and allows to remove the
eee-broken-xxx properties from DT. As EEE is disabled anyway, we can
remove also the set_eee ethtool op.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/d08a798e-8565-422c-b2ed-121794db077f@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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