am 6bfaf64c: Revert "STK Call Control feature implementation."

* commit '6bfaf64c427b4d48a4fb1931eb8b5c0f79ce20f1':
  Revert "STK Call Control feature implementation."
tree: 720b2d0eebd6d995b252c37f26ebb2668d345f16
  1. include/
  2. libril/
  3. librilutils/
  4. reference-ril/
  5. rild/
  6. CleanSpec.mk