Extract dist properties from commonProperties

Common properties are automatically inherited from a parent module
(i.e. one that calls CreateModule()) to the child module that it
creates. This makes no sense for dist/dists properties so this change
extracts them into their own structure separate to the
commonProperties.

Test: m checkbuild and TreeHugger
Bug: 160448975
Change-Id: Icceb20455e13394dd3b3bce464fb9bb34882d6c3