net: phy: fix phylib's dual eee_enabled

phylib has two eee_enabled members. Some parts of the code are using
phydev->eee_enabled, other parts are using phydev->eee_cfg.eee_enabled.
This leads to incorrect behaviour as their state goes out of sync.
ethtool --show-eee shows incorrect information, and --set-eee sometimes
doesn't take effect.

Fix this by only having one eee_enabled member - that in eee_cfg.

Fixes: 49168d19 ("net: phy: Add phy_support_eee() indicating MAC support EEE")
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://patch.msgid.link/E1tBXAF-00341F-EQ@rmk-PC.armlinux.org.uk


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