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Adds support for Layer 2 multicast by implementing the DSA port_mdb_* callbacks. The Kernel bridge listens to IGMP/MLD messages trapped to the CPU-port, and calls the Multicast Forwarding Database updates. The updates manage the L2 forwarding entries and the multicast port-maps. Signed-off-by: Birger Koblitz <git@birger-koblitz.de>