DEPL4 — AssemblyController Component Lacking

Issue 2: AssemblyController Component Lacking
Lacking the capability of expressing a AssemblyController component in a
assembly component description. One use case is the SCA and the SWRadio
spec. The assembly controller is the component in assembly that is the main
controller and the Application proxy communicates with when specified.
Recommendation:
Add an optional AssemblyControllerComponent Element to the
AssemblyComponent description. The AssemblyControllerComponent Element
definition contains an attribute, which identifies the component in the
assembly that is the assembly controller component. Add
AssemblyControllerComponent Element as subsection to 6.4. Update section
6.4.9.1 figure. Update PSM XML for ComponentAssemblyDescription.

This also allows PSMs to constraint the definition to always none or
mandatory for a assembly controller.