6lowpan: move 6lowpan header to include/net

This header is used by bluetooth and ieee802154 branch. This patch
move this header to the include/net directory to avoid a use of a
relative path in include.
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bluetooth/6lowpan.c

@@ -27,7 +27,7 @@
 
 #include "6lowpan.h"
 
-#include "../ieee802154/6lowpan.h" /* for the compression support */
+#include <net/6lowpan.h> /* for the compression support */
 
 #define IFACE_NAME_TEMPLATE "bt%d"
 #define EUI64_ADDR_LEN 8

net/ieee802154/6lowpan_iphc.c

@@ -54,11 +54,10 @@
 #include <linux/if_arp.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
+#include <net/6lowpan.h>
 #include <net/ipv6.h>
 #include <net/af_ieee802154.h>
 
-#include "6lowpan.h"
-
 /*
  * Uncompress address function for source and
  * destination address(non-multicast).

net/ieee802154/6lowpan_rtnl.c

@@ -52,10 +52,10 @@
 #include <net/af_ieee802154.h>
 #include <net/ieee802154.h>
 #include <net/ieee802154_netdev.h>
+#include <net/6lowpan.h>
 #include <net/ipv6.h>
 
 #include "reassembly.h"
-#include "6lowpan.h"
 
 static LIST_HEAD(lowpan_devices);
 

net/ieee802154/reassembly.c

@@ -24,10 +24,10 @@
 #include <linux/export.h>
 
 #include <net/ieee802154_netdev.h>
+#include <net/6lowpan.h>
 #include <net/ipv6.h>
 #include <net/inet_frag.h>
 
-#include "6lowpan.h"
 #include "reassembly.h"
 
 static struct inet_frags lowpan_frags;