kdump-core: Build from the rootfs If we don't have an initrd already, we need to make the basic contents for one. To make this process universal, we always rebuild the crashdump initrd from the system components that are guaranteed to always exist. Tested: Verified Kdump works on existing systems and with no initrd. Google-Bug-Id: 392974094 Change-Id: I1a84e1f4537744b4a24907b9a1094707187bfe8c Signed-off-by: William A. Kennington III <wak@google.com>