Phonet: allocate separate ARP type for GPRS over a Phonet pipe

A separate xmit lock class supports GPRS over a Phonet pipe over a TUN
device (type ARPHRD_NONE).

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/if_arp.h b/include/linux/if_arp.h
index 11df77a..5ff8980 100644
--- a/include/linux/if_arp.h
+++ b/include/linux/if_arp.h
@@ -88,6 +88,7 @@
 #define ARPHRD_IEEE80211_RADIOTAP 803	/* IEEE 802.11 + radiotap header */
 
 #define ARPHRD_PHONET	820		/* PhoNet media type		*/
+#define ARPHRD_PHONET_PIPE 821		/* PhoNet pipe header		*/
 
 #define ARPHRD_VOID	  0xFFFF	/* Void type, nothing is known */
 #define ARPHRD_NONE	  0xFFFE	/* zero header length */