net: emaclite: adding MDIO and phy lib support

These changes add MDIO and phy lib support to the driver as the
IP core now supports the MDIO bus.

The MDIO bus and phy are added as a child to the emaclite in the device
tree as illustrated below.

mdio {
	#address-cells = <1>;
	#size-cells = <0>;
	phy0: phy@7 {
		compatible = "marvell,88e1111";
		reg = <7>;
	} ;
}

Signed-off-by: Sadanand Mutyala <[email protected]>
Signed-off-by: John Linn <[email protected]>
Acked-by: Grant Likely <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: John Linn

drivers/net/Kconfig

@@ -1963,6 +1963,7 @@ config ATL2
 config XILINX_EMACLITE
 	tristate "Xilinx 10/100 Ethernet Lite support"
 	depends on PPC32 || MICROBLAZE
+	select PHYLIB
 	help
 	  This driver supports the 10/100 Ethernet Lite from Xilinx.