event/opdl: fix atomic queue race condition

event/opdl: fix atomic queue race condition

If application link one atomic queue to multiple ports,
and each worker core update flow_id, there will have a
chance to hit race condition issue and lead to double processing
same event. This fix solve the problem and eliminate
the race condition issue.

Fixes: 4236ce9bf5bf ("event/opdl: add OPDL ring infrastructure library")
Cc: stable@dpdk.org
Signed-off-by: Liang Ma <liang.j.ma@intel.com>
Signed-off-by: Peter Mccarthy <peter.mccarthy@intel.com>
Acked-by: Harry van Haaren <harry.van.haaren@intel.com>