[AFS]: Replace rtnetlink client by direct dev_base walking

Replace the large and complicated rtnetlink client by two simple
functions for getting the MAC address for the first ethernet device
and building a list of IPv4 addresses.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

fs/afs/internal.h

@@ -349,7 +349,6 @@ struct afs_permits {
  * record of one of a system's set of network interfaces
  */
 struct afs_interface {
-	unsigned	index;		/* interface index */
 	struct in_addr	address;	/* IPv4 address bound to interface */
 	struct in_addr	netmask;	/* netmask applied to address */
 	unsigned	mtu;		/* MTU of interface */