ar71xx: adjust ew-dorin platform for LAN+WAN setup

Signed-off-by: Embedded Wireless GmbH <info at embeddedwireless.de>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39763 3c298f89-4303-0410-b956-a3cf2f4a3e73
ar71xx: Add 16MB Flash version for Embedded Wireless Dorin Platform

Signed-off-by: Embedded Wireless GmbH <info at embeddedwireless.de>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39764 3c298f89-4303-0410-b956-a3cf2f4a3e73