[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/bpqether.c b/drivers/net/hamradio/bpqether.c
index 4bff23e..5ddf8b0 100644
--- a/drivers/net/hamradio/bpqether.c
+++ b/drivers/net/hamradio/bpqether.c
@@ -483,8 +483,7 @@
 	dev->flags      = 0;
 
 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
-	dev->hard_header     = ax25_hard_header;
-	dev->rebuild_header  = ax25_rebuild_header;
+	dev->header_ops      = &ax25_header_ops;
 #endif
 
 	dev->type            = ARPHRD_AX25;