This adds support for ZyXEL NBG6616 uboot-env access
Signed-off-by: Christoph Krapp <achterin@googlemail.com>
[add "ar71xx" to commit title]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
(cherry picked from commit eb95ca3b5c8b33e3212896f906922eba5f72abb3)