Add header files for the new converged configuration component.
cfg_dispatcher.h: Contains dispatcher lifecycle handlers
cfg_define.h: Tools for components to define new configuration metadata
cfg_ucfg.h: Contains APIs for consuming configuration at runtime
cfg_converged.h: Contains a collection of configuration metadata from
all the converged components
Change-Id: Ief5d3e33dca1bc5f8dba47d9e0c03a97ad1b371f
CRs-Fixed: 2196017
