tipc: add peer removal functionality

Add TIPC_NL_PEER_REMOVE netlink command. This command can remove
an offline peer node from the internal data structures.

This will be supported by the tipc user space tool in iproute2.

Signed-off-by: Richard Alpe <richard.alpe@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/tipc/net.h b/net/tipc/net.h
index 77a7a11..c7c2549 100644
--- a/net/tipc/net.h
+++ b/net/tipc/net.h
@@ -39,6 +39,8 @@
 
 #include <net/genetlink.h>
 
+extern const struct nla_policy tipc_nl_net_policy[];
+
 int tipc_net_start(struct net *net, u32 addr);
 
 void tipc_net_stop(struct net *net);