net: dsa: ksz_common: use separate phylink_mac_ops for ksz8830

Use a separate phylink_mac_ops for the KSZ8830 chip-id.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://lore.kernel.org/r/E1s0O7R-009gq2-Qm@rmk-PC.armlinux.org.uk


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