eventdev: fix symbol export for port maintenance

[ upstream commit 4d23cf66ec1b666676b228f3d2a54d0c74b289da ]

Trying to call rte_event_maintain out of the eventdev library triggers
a link failure, as the tracepoint symbol associated to this inline
helper was not exported.

Fixes: 54f1784 ("eventdev: add port maintenance API")

Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>

lib/eventdev/version.map

@@ -101,6 +101,7 @@ EXPERIMENTAL {
 	global:
 
 	# added in 21.11
+	__rte_eventdev_trace_maintain;
 	rte_event_eth_rx_adapter_create_with_params;
 	rte_event_eth_rx_adapter_queue_conf_get;
 	rte_event_eth_rx_adapter_queue_stats_get;