Merge changes from topic "od/spm"

* changes:
  cactus: generate JSON file required by TF-A
  tftf: re-introduce spm tests in the flow
  cactus: update sample manifest to SPCI Beta1 format
  cactus: add symbols relocation fixup
  cactus: update build options and memory map to make it PIE
  cactus: update to SPCI Beta1 and add sample direct messaging test
  tftf: SPCI Beta1 add direct messaging test
  tftf: update SPCI svc header to latest Beta1 spec
  tftf: provide hvc conduit facility