Change payload type to int32_t for fmq device tests am: c5d4cd58a7 am: 9da62ad641

Original change: https://android-review.googlesource.com/c/platform/system/libfmq/+/1431616

Change-Id: Ic76fd58bbe17a314763e680c1798e0be1b993d44
tree: 9a258cc37a83999b346bb92399ee29379fd9d1d5
  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