On UBI enabled devices, U-Boot might store it's environment on
UBI volume(s). Support this in uboot-envtools, so fw_setenv and
fw_printenv can work on these platforms.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40929 3c298f89-4303-0410-b956-a3cf2f4a3e73