Remove unused EventFlag constructor am: 6a548ad593 am: e112f11304

Original change: https://android-review.googlesource.com/c/platform/system/libfmq/+/1792490

Change-Id: I9eafe2c9099275691a41b0ed34f257444ee46014
tree: 095e0d2a6979f793f6f497178cff218396ca1ae0
  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