Revert "removed expect from mkimage-arch since it was not working"

This reverts commit 962e1186f9a0a43344e19dcf70bac159f0eafb4e.

Conflicts:
	contrib/mkimage-arch.sh

Docker-DCO-1.1-Signed-off-by: Zoltan Tombol <zoltan.tombol@gmail.com> (github: ztombol)
Fix expect script in mkimage-arch

Docker-DCO-1.1-Signed-off-by: Zoltan Tombol <zoltan.tombol@gmail.com> (github: ztombol)