Added an example of @FixedSize union am: 75253c2507

Original change: https://android-review.googlesource.com/c/platform/system/libfmq/+/1893915

Change-Id: I58420890a46e8cb0b17e2c42e0e48ef0e0ae544d
tree: dd6725cd3e27d07ea75d46d5f20c0a776303a1e7
  1. base/
  2. benchmarks/
  3. fuzzer/
  4. include/
  5. tests/
  6. Android.bp
  7. EventFlag.cpp
  8. FmqInternal.cpp
  9. OWNERS
  10. PREUPLOAD.cfg
  11. TEST_MAPPING