mediatek: filogic: fix 2.5G phy compatible for WR3000H

mediatek: filogic: fix 2.5G phy compatible for WR3000H

Following the initial support of the Cudy WR3000H with PHY C22 for the 2.5G WAN
interface, several improvements fixing issues with RealTek RTL8221B PHYs have
been merged.
Therefore we can now bring the DT in line with other equipment and declare the
2.5G WAN PHY as C45.

Fixes: 9d66b8b ("mediatek: filogic: Add support for cudy wr3000h")
Signed-off-by: Juan Pedro Paredes Caballero <juanpedro.paredes@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/17739
[reword commit description]
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>