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/net/phonet/pep-gprs.c b/net/phonet/pep-gprs.c
index 0b640b0..a287320 100644
--- a/net/phonet/pep-gprs.c
+++ b/net/phonet/pep-gprs.c
@@ -260,7 +260,7 @@
 static void gprs_setup(struct net_device *dev)
 {
 	dev->features		= NETIF_F_FRAGLIST;
-	dev->type		= ARPHRD_NONE;
+	dev->type		= ARPHRD_PHONET_PIPE;
 	dev->flags		= IFF_POINTOPOINT | IFF_NOARP;
 	dev->mtu		= GPRS_DEFAULT_MTU;
 	dev->hard_header_len	= 0;