fmq_unit_tests: remove objects form the heap am: cdf8d33b16

Original change: https://android-review.googlesource.com/c/platform/system/libfmq/+/2230529

Change-Id: Ice394c81034749b76ac101ddf9d0b5b4d654b432
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>