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