net: mediatek: fix direct MDIO clause 45 access via SoC

The original direct MDIO clause 45 access via SoC is missing the
data output. This patch adds it back to ensure MDIO clause 45 can
work properly for external PHYs.

Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
1 file changed