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Add support for Congestion State Change Notifications (CSCN), which allow DPIO users to be notified when a congestion group changes its state (due to hitting the entrance / exit threshold). Acked-by: Li Yang <leoyang.li@nxp.com> Signed-off-by: Horia Geantă <horia.geanta@nxp.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>