libfmq: merge upstream into ToT

BUG=b:157855577
TEST=FEATURES=test emerge-betty nnapi aosp-frameworks-ml-nn

Cq-Depend: chromium:2490122, chromium:2490181
Change-Id: I9add9c041f060bf25f5e855ab7e774748d9e5c01
tree: 6d3d9da9942b38f318bc49866e0dca5ffefd99c8
  1. base/
  2. benchmarks/
  3. include/
  4. tests/
  5. Android.bp
  6. EventFlag.cpp
  7. FmqInternal.cpp
  8. OWNERS
  9. PREUPLOAD.cfg
  10. TEST_MAPPING