net: dsa: ksz_common: remove phylink_mac_config from ksz_dev_ops

The phylink_mac_config function pointer member of struct ksz_dev_ops is
never initialised, so let's remove it to simplify the code.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://lore.kernel.org/r/E1s0O7C-009gpk-Dh@rmk-PC.armlinux.org.uk


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