[][OpenWrt Dev][Add support for u-boot env-tools for ubi devices]

[Description]
Add support for u-boot env-tools for ubi devices

[Release-log]
N/A

Change-Id: Idece98c690ae40f5814bff7f105026862923ddbb
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6105793
1 file changed