Added support for booting ramfs-based images (e.g, poky-tiny) which
do not have block device support.
This fixes [YOCTO #2612].
(From OE-Core rev: b09c45f017da71ff966004752f8e926ea00ac451)
Signed-off-by: Scott Garman <scott.a.garman@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>