ARM: dts: berlin: Add phy-connection-type to BG2Q Ethernet

Internal FastEthernet PHY on BG2Q is connected via MII, add a
corresponding phy-connection-type property to the Ethernet node.
Tested-by: NAntoine Ténart <antoine.tenart@free-electrons.com>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>

arch/arm/boot/dts/berlin2q.dtsi

@@ -123,6 +123,7 @@
 			local-mac-address = [00 00 00 00 00 00];
 			#address-cells = <1>;
 			#size-cells = <0>;
+			phy-connection-type = "mii";
 			phy-handle = <&ethphy0>;
 			status = "disabled";