[AX.25]: Rename ax25_encapsulate to ax25_hard_header

Rename ax25_encapsulate to ax25_hard_header which these days more
accurately describes what the function is supposed to do.

Signed-off-by: Ralf Baechle DL5RB <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index ed705dd..17f192b 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -1984,7 +1984,7 @@
 	.notifier_call =ax25_device_event,
 };
 
-EXPORT_SYMBOL(ax25_encapsulate);
+EXPORT_SYMBOL(ax25_hard_header);
 EXPORT_SYMBOL(ax25_rebuild_header);
 EXPORT_SYMBOL(ax25_findbyuid);
 EXPORT_SYMBOL(ax25_find_cb);