Most of the tools packages are not usable on s390x so
explicitly list them.
Also removed arm64 from mkimage-gcp as GCP does not
support arm machines and fixed a minor inconsistency
the way the architecture was specified in mkimage-raw-bios.
Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
Remove the grub2 patch from LinuxKit since it has already been merged
into the CoreOS grub2 mainline code.
Signed-off-by: Dennis Chen <dennis.chen@arm.com>
