Add KUKSA.val to demo platform

As discussed in various EG calls and the F2F meetings, kuksa.val is the proposed replacement for the functionality previously provided by the signal-composer API in the old application framework.  This issue is to track the addition of the required recipes and other changes to get the kuksa.val server and related components into the demo platform images.  A separate issue (or issues) will be used to track changes to enable using it in the demo applications.