net/ena: fix missing default llq policy

The driver failed to set a default llq_header_policy,
causing LLQ to be disabled when the devarg value is
not specified by the application.

Fixes: d7918d1 ("net/ena: restructure LLQ policy user setting")
Cc: stable@dpdk.org
Signed-off-by: Yosef Raisman <yraisman@amazon.com>
Signed-off-by: Shai Brandes <shaibran@amazon.com>
Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>

drivers/net/ena/ena_ethdev.c

@@ -2330,6 +2330,7 @@ static int eth_ena_dev_init(struct rte_eth_dev *eth_dev)
 
 	/* Assign default devargs values */
 	adapter->missing_tx_completion_to = ENA_TX_TIMEOUT;
+	adapter->llq_header_policy = ENA_LLQ_POLICY_RECOMMENDED;
 
 	/* Get user bypass */
 	rc = ena_parse_devargs(adapter, pci_dev->device.devargs);