s390/qeth: move netif_napi_add_tx() and napi_enable() from under BH

Like other drivers qeth is calling local_bh_enable() after napi_schedule()
to kick-start softirqs [0].
Since netif_napi_add_tx() and napi_enable() now take the netdev_lock()
mutex [1], move them out from under the BH protection. Same solution as in
commit a60558644e20 ("wifi: mt76: move napi_enable() from under BH")

Fixes: 1b23cdbd2bbc ("net: protect netdev->napi_list with netdev_lock()")
Link: https://lore.kernel.org/netdev/[e-mail]/ [0]
Link: https://lore.kernel.org/netdev/[e-mail]/ [1]
Signed-off-by: Alexandra Winter <[e-mail]>
Acked-by: Joe Damato <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/s390/net/qeth_core_main.c

···
 	card->data.state = CH_STATE_UP;
 	netif_tx_start_all_queues(dev);
 
-	local_bh_disable();
 	qeth_for_each_output_queue(card, queue, i) {
 		netif_napi_add_tx(dev, &queue->napi, qeth_tx_poll);
 		napi_enable(&queue->napi);
+	}
+	napi_enable(&card->napi);
+
+	local_bh_disable();
+	qeth_for_each_output_queue(card, queue, i) {
 		napi_schedule(&queue->napi);
 	}
-
-	napi_enable(&card->napi);
 	napi_schedule(&card->napi);
 	/* kick-start the NAPI softirq: */
 	local_bh_enable();