This is a replacement for u-boot-fw-utils. Adapt the u-boot-fw-utils patches
to this new library and include the same logic as the u-boot-fw-utils recipe
(generate and install the U-Boot environment configuration file in the rootfs)
For now, remove the u-boot-default-env dependency, since the package doesn't
exist in zeus.
https://jira.digi.com/browse/DEL-7410
Signed-off-by: Gabriel Valcazar <gabriel.valcazar@digi.com>