Merge changes from topic "el0-app-support" into integration

* changes:
  feat(lib): implement app support for host build
  feat(app/common): initialise console for apps
  feat(app/common/el0_app): add app helper library
  feat(app/common): add app service framework
  feat(app): add framework to run an el0 app
  feat(lib/xlat): get ASID from TTBR1_EL2
  feat(lib/slot_buf): Add new slots
  feat(app): add code to parse app bin headers
  build(app): add python scripts for El0 apps