This change adds a help target so we can see what the valid targets are
and what they do, and also identifies the phony targets.
Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: Ie61d44d87e8628e12d01f3355360e2a679b5ce85
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75496
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
e441b31917
