net: delete all instances of special processing for token ring

We are going to delete the Token ring support.  This removes any
special processing in the core networking for token ring, (aside
from net/tr.c itself), leaving the drivers and remaining tokenring
support present but inert.

The mass removal of the drivers and net/tr.c will be in a separate
commit, so that the history of these files that we still care
about won't have the giant deletion tied into their history.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

net/ipv4/arp.c

@@ -89,7 +89,6 @@
 #include <linux/etherdevice.h>
 #include <linux/fddidevice.h>
 #include <linux/if_arp.h>
-#include <linux/trdevice.h>
 #include <linux/skbuff.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
@@ -193,9 +192,6 @@ int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir)
 	case ARPHRD_IEEE802:
 		ip_eth_mc_map(addr, haddr);
 		return 0;
-	case ARPHRD_IEEE802_TR:
-		ip_tr_mc_map(addr, haddr);
-		return 0;
 	case ARPHRD_INFINIBAND:
 		ip_ib_mc_map(addr, dev->broadcast, haddr);
 		return 0;
@@ -647,12 +643,6 @@ struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
 		arp->ar_hrd = htons(ARPHRD_ETHER);
 		arp->ar_pro = htons(ETH_P_IP);
 		break;
-#endif
-#if IS_ENABLED(CONFIG_TR)
-	case ARPHRD_IEEE802_TR:
-		arp->ar_hrd = htons(ARPHRD_IEEE802);
-		arp->ar_pro = htons(ETH_P_IP);
-		break;
 #endif
 	}
 
@@ -751,11 +741,10 @@ static int arp_process(struct sk_buff *skb)
 			goto out;
 		break;
 	case ARPHRD_ETHER:
-	case ARPHRD_IEEE802_TR:
 	case ARPHRD_FDDI:
 	case ARPHRD_IEEE802:
 		/*
-		 * ETHERNET, Token Ring and Fibre Channel (which are IEEE 802
+		 * ETHERNET, and Fibre Channel (which are IEEE 802
 		 * devices, according to RFC 2625) devices will accept ARP
 		 * hardware types of either 1 (Ethernet) or 6 (IEEE 802.2).
 		 * This is the case also of FDDI, where the RFC 1390 says that