Remove the "--select a machine--" prompt in machine selection.
Also change "--select a base image--" to "Start from scratch" for
base image selection.
(Bitbake rev: ac36d218ed6793d6fbf3edfadaf193629ea1e46d)
Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>