Use customized event flag for data FMQ not_empty to avoid conflict

Bug: 335547630
Test: atest --test-mapping hardware/interfaces/audio/aidl/vts:presubmit
Change-Id: I0f5776edd58748195df61e4dae911df30f40e5b0
Merged-In: I0f5776edd58748195df61e4dae911df30f40e5b0
3 files changed