Fix the PLL register value for 10 Mbit/s link modes on TP-Link EAP
boards using a AR8033 SGMII PHY.
Otherwise, 10 Mbit/s links do not transfer data.
Reported-by: Tom Herbers <freifunk@tomherbers.de>
Tested-by: Tom Herbers <freifunk@tomherbers.de>
Signed-off-by: David Bauer <mail@david-bauer.net>
(cherry picked from commit bbff6239e2)