gmac0 is always connected to switch phy4 and mdio1 is always needed.
So add phy handle for eth0 and enable mdio1 by default.
Move fixed-link for gmac1 from device dts to ar9331.dtsi because gmac1 is always connected to builtin switch.
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
This target can automatically detect the correct memory size and we've
been using it for long in ar71xx.
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>