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

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

[Release-log]
N/A

Change-Id: I86459f608e113a9dbe2fb69eea9494d7504195ff
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5664321
1 file changed