Change u-boot-env partitions to be mounted as read-write for gl-ar150,
gl-domino and gl-mifi so uboot-envtools support is possible.
Signed-off-by: Kimmo Vuorinen <kimmo.vuorinen@gmail.com>
[commit title/message facelift]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>