am 10f9a372: Merge upstream sepolicy into AOSP

* commit '10f9a372':
  Corrected gramatical issues
  Added new line to end of file
  Changed seapp_contexts temporary file naming
  Fix mls checking code
  Support overrides in seapp_contexts
  Add tf_daemon labeling support.
  Add ppp/mtp policy.
  per device seapp_context support
  dhcp policy.
  Trusted Execution Environment policy.