tipc: move broadcast link lock to struct tipc_net

The broadcast lock will need to be acquired outside bcast.c in a later
commit. For this reason, we move the lock to struct tipc_net. Consistent
with the changes in the previous commit, we also introducee two new
functions tipc_bcast_lock() and tipc_bcast_unlock(). The code that is
currently using tipc_bclink_lock()/unlock() will be phased out during
the coming commits in this series.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/core.h

@@ -93,6 +93,7 @@ struct tipc_net {
 	struct tipc_bearer __rcu *bearer_list[MAX_BEARERS + 1];
 
 	/* Broadcast link */
+	spinlock_t bclock;
 	struct tipc_bcbearer *bcbearer;
 	struct tipc_bc_base *bcbase;
 	struct tipc_link *bcl;