[Bluetooth]: Move packet type into the SKB control buffer

This patch moves the usage of packet type into the SKB control
buffer. After this patch it is now possible to shrink the sk_buff
structure and redefine its pkt_type.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
index 5309b6f..6dfa4a6 100644
--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -131,7 +131,8 @@
 
 /* Skb helpers */
 struct bt_skb_cb {
-	int incoming;
+	__u8 pkt_type;
+	__u8 incoming;
 };
 #define bt_cb(skb) ((struct bt_skb_cb *)(skb->cb))