eventdev: add event buffer flush in Rx adapter
eventdev: add event buffer flush in Rx adapter

Add an event buffer flush when the current invocation
of the Rx adapter is completed.

This patch provides lower latency in case there is a
BATCH_SIZE of events in the event buffer.

Cc: stable@dpdk.org

Suggested-by: Narender Vangati <7dd0f0bd921ec83dabd01ad3fd6d6ec730730484@intel.com>
Signed-off-by: Nikhil Rao <d1996eefd6f63075256880b1bd8999364b16b5fc@intel.com>
Acked-by: Jerin Jacob <5bca7d2a432bc0f5422b70b2701a4e4fa32edd00@caviumnetworks.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk