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

* changes:
  Properly guard newly added APIs in P
  Openmp blocktime 1->20ms to keep cores enabled
  Add asan library dependency for CI
tree: b9e1d59c9267f609f82c8ee6e01425506a11ba59
  1. nn/
  2. CleanSpec.mk
  3. OWNERS