This fixes incorrect supported link modes indicated when using ethtool
on the Ubiquiti UniFi AC lite / LR / Mesh.
eroot@OpenWrt:~# ethtool eth0
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 100baseT/Half 100baseT/Full
1000baseT/Full
1000baseX/Full
The reason for this is, that since kernel 5.4 the PHY capabilities are
read dynamically from the PHY. As Ubiquiti leaves the PHY in a wrong
state, the capabilities of the SGMII side of the PHY are read.
As a side effect, 10 Mbit/s link modes did not work on these boards.
Signed-off-by: David Bauer <mail@david-bauer.net>
