imx: coretexa53: add network configuration for gw82xx-2x

imx: coretexa53: add network configuration for gw82xx-2x

The GW82xx-2x has two network ports. By convention, the first
port (eth0) should be the WAN port and the second port (eth1)
should be the LAN port.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Link: https://github.com/openwrt/openwrt/pull/17717
Signed-off-by: Robert Marko <robimarko@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/17762
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit d2eaaa90d502fa418d7d9bb8d4e6ccbe0131c832)