[NET]: Move hardware header operations out of netdevice.

Since hardware header operations are part of the protocol class
not the device instance, make them into a separate object and
save memory.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/hamradio/scc.c b/drivers/net/hamradio/scc.c
index 39b3b82..353d13e 100644
--- a/drivers/net/hamradio/scc.c
+++ b/drivers/net/hamradio/scc.c
@@ -1551,8 +1551,8 @@
 	dev->stop	     = scc_net_close;
 
 	dev->hard_start_xmit = scc_net_tx;
-	dev->hard_header     = ax25_hard_header;
-	dev->rebuild_header  = ax25_rebuild_header;
+	dev->header_ops      = &ax25_header_ops;
+
 	dev->set_mac_address = scc_net_set_mac_address;
 	dev->get_stats       = scc_net_get_stats;
 	dev->do_ioctl        = scc_net_ioctl;