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Add a new helper returning the local port used to reach an arbitrary switch port in the fabric. Its only user at the moment is the dsa_upstream_port helper, which returns the local port reaching the dedicated CPU port, but it will be used in cross-chip FDB operations. Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Signed-off-by: David S. Miller <davem@davemloft.net>