ipq806x: ap3935: Use gmac0 mdio controller
Updates ap3935 target to use the mdio controller built-in to gmac0,
rather than having the SoC bit-bang mdio from gpio pins
Signed-off-by: Bryan Berg <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/13629
Signed-off-by: Christian Marangi <[email protected]>