net: hns3: fix hns3_cae_pfc_storm.h missing header guard problem

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

----------------------------

This patch adds missing header guard to the hns3_cae_pfc_storm.h.

Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>
Reviewed-by: li yongxin <liyongxin1@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>

drivers/net/ethernet/hisilicon/hns3/hns3_cae/hns3_cae_pfc_storm.h

 /* SPDX-License-Identifier: GPL-2.0+ */
 /* Copyright (c) 2016-2019 Hisilicon Limited. */
 
+#ifndef __HNS3_CAE_PFC_STORM_H__
+#define __HNS3_CAE_PFC_STORM_H__
+
 #include "hns3_cae_cmd.h"
 #include "hns3_enet.h"
 
@@ -27,3 +30,5 @@ struct cmd_pfc_storm_param {
 int hns3_cae_pfc_storm_cfg(const struct hns3_nic_priv *net_priv,
 			   void *buf_in, u32 in_size, void *buf_out,
 			   u32 out_size);
+
+#endif