net: bridge: multicast: add EHT source set handling functions

Add EHT source set and set-entry create, delete and lookup functions.
These allow to manipulate source sets which contain their own host sets
with entries which joined that S,G. We're limiting the maximum number of
tracked S,G entries per host to PG_SRC_ENT_LIMIT (currently 32) which is
the current maximum of S,G entries for a group. There's a per-set timer
which will be used to destroy the whole set later.

Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
diff --git a/net/bridge/br_private_mcast_eht.h b/net/bridge/br_private_mcast_eht.h
index 0c9c426..bba507c 100644
--- a/net/bridge/br_private_mcast_eht.h
+++ b/net/bridge/br_private_mcast_eht.h
@@ -47,4 +47,6 @@ struct net_bridge_group_eht_set {
 	struct net_bridge_mcast_gc	mcast_gc;
 };
 
+void br_multicast_eht_clean_sets(struct net_bridge_port_group *pg);
+
 #endif /* _BR_PRIVATE_MCAST_EHT_H_ */