bridge: Add multicast start/stop hooks

This patch hooks up the bridge start/stop and add/delete/disable
port functions to the new multicast module.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bridge/br_stp.c b/net/bridge/br_stp.c
index fd3f8d6..edcf14b 100644
--- a/net/bridge/br_stp.c
+++ b/net/bridge/br_stp.c
@@ -386,6 +386,8 @@
 	else
 		p->state = BR_STATE_LEARNING;
 
+	br_multicast_enable_port(p);
+
 	br_log_state(p);
 
 	if (br->forward_delay != 0)