[qca-nss-sfe] add fast xmit features

call hard start xmit in some case that no vlan tag exist,
won't go to xfrm nor qdisc exist.

Change-Id: I94104b0ce8d0e86ee6e63dc401ec042351ef63c7
Signed-off-by: Ken Zhu <quic_guigenz@quicinc.com>
diff --git a/sfe.h b/sfe.h
index 15658e1..c117729 100644
--- a/sfe.h
+++ b/sfe.h
@@ -134,6 +134,11 @@
 extern int nf_ct_tcp_no_window_check;
 
 /*
+ * Check the fast transmit feasibility.
+ */
+bool sfe_fast_xmit_check(struct sk_buff *skb, netdev_features_t features);
+
+/*
  * This callback will be called in a timer
  * at 100 times per second to sync stats back to
  * Linux connection track.