[IPSEC]: Unexport xfrm_replay_notify

Now that the only callers of xfrm_replay_notify are in xfrm, we can remove
the export.

This patch also removes xfrm_aevent_doreplay since it's now called in just
one spot.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index 20e789d..40d75ec 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -60,7 +60,8 @@
 
 		if (x->type->flags & XFRM_TYPE_REPLAY_PROT) {
 			XFRM_SKB_CB(skb)->seq = ++x->replay.oseq;
-			xfrm_aevent_doreplay(x);
+			if (xfrm_aevent_is_on())
+				xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
 		}
 
 		err = x->mode->output(x, skb);