Change default channels duplication for chordal ring (#233)

[ROCm/rccl commit: ab787c767e]

projects/rccl/src/include/graph.h

@@ -101,4 +101,6 @@ ncclResult_t ncclTopoTuneModel(struct ncclComm* comm, int minCompCap, int maxCom
 #include "info.h"
 ncclResult_t ncclTopoGetAlgoTime(struct ncclInfo* info, int algorithm, int protocol, float* time);
 
+ncclResult_t parseChordalRing(struct ncclTopoSystem* system, char **str);
+
 #endif