1. Swap eth0/eth1
Both devices are using AR9331, the builtin switch on AR9331 is
connected to gmac1 and gmac1 is named as eth1 in ath79.
PS: gmac1 is eth0 and gmac0 is eth1 in ar71xx because of the
reversed initialization order.
2. Fix the incorrect compatible string in dts
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>