Add uboot-envtools support for Gateworks venice boards based on i.MX8M
SoC's (imx_cortexa53) which boot from and store their U-Boot env on
eMMC boot0 hardware partition.
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Link: https://github.com/openwrt/openwrt/pull/19347
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>