Merge changes from topic "nnapi-cherrypick-from-master-to-aosp"

* changes:
  Use TFLite benchmark support in runner script
  Add driver benchmark and JSON output to benchmark.
  Add benchmark-friendly output to systrace parser
  NNAPI systrace parser
  Disable OpenMP for CPU fallback implementation.
tree: ae756a652c4bd6b8fd55e1f473b3d2c3ef61d304
  1. nn/
  2. CleanSpec.mk
  3. OWNERS