syscall: remove obsolete UserspaceCallback stuff

Change-Id: I558bf34f6929dc77f5f57110e1363f87dac59059
3 files changed
tree: 700c84bfd846c300d5072dc4545fe724682abcda
  1. firmware/
  2. util/
  3. .gitignore
  4. CodingStandard.txt