Merge changes from topic "kc/stmm" into integration

* changes:
  fix(build): run sp_mk_gen.py with poetry
  feat(sptool): add StMM memory region descriptor
  feat(sptool): specify endianness for HOB bin
  feat(fvp): increase cactus-tertiary size
  feat(sptool): include HOB file in the TL pkg
  feat(sptool): invoke the HOB list creation code
  feat(sptool): add the HOB list creation script
  chore: add fdt dependencies to poetry