[qca-nss-sfe] PPPoE offload fixes

1. Fix protocol and endianess
2. Fix copyright year style
3. Pass non-NULL l2_info and check parse flags before using l2_info

Change-Id: I7801834b224a39a04450fdacbbb9cb9620b4221c
Signed-off-by: Guduri Prathyusha <quic_gprathyu@quicinc.com>
diff --git a/exports/sfe_api.h b/exports/sfe_api.h
index a69dfe9..75077b0 100644
--- a/exports/sfe_api.h
+++ b/exports/sfe_api.h
@@ -3,7 +3,7 @@
  *	 SFE exported function headers for SFE engine
  *
  * Copyright (c) 2015,2016, The Linux Foundation. All rights reserved.
- * Copyright (c) 2021,2022 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above