This change enables proper Ethernet link status and speed reporting on
the Ubiquiti UniFi 6 LR access point:
mtk_soc_eth 1b100000.ethernet eth0: PHY [mdio-bus:08] driver [Aquantia AQR112C] (irq=POLL)
mtk_soc_eth 1b100000.ethernet eth0: configuring for phy/2500base-x link mode
mtk_soc_eth 1b100000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
Signed-off-by: Daniel Golle <daniel@makrotopia.org>