The mii_select node is used to determine the fec1's interface
type. Using "enable-active-high" property to configure the
interface type as "RMII". Deleting the property as "RGMII".
Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>