NET: QE: UEC: Make uec_miiphy_read() and uec_miiphy_write() use the devname arg.

The current uec_miiphy_read and uec_miiphy_write hardcode access devlist[0]
This patch makes these function use the devname argument that is passed in to
allow access to the phy registers of other devices in devlist[].

Signed-of-by: Richard Retanubun <RichardRetanubun@RugggedCom.com>

Signed-off-by: Ben Warren <biggerbadderben@gmail.com>