Revert "Initial support for clique-based kernels (#276)" (#280)

This reverts commit d68a532bc6.

[ROCm/rccl commit: 84a2541e01]

projects/rccl/src/include/comm.h

@@ -10,9 +10,6 @@
 
 #include "transport.h"
 #include "p2p.h"
-// [RCCL]
-#include "clique/CliqueManager.h"
-// [/RCCL]
 
 #if defined(__HIP_PLATFORM_HCC__) || defined(__HCC__) || defined(__HIPCC__)
 #else
@@ -146,12 +143,8 @@ struct ncclComm {
   //list of async p2p operation queued in a group semantics
   struct ncclP2Plist p2plist;
 
-  // [RCCL]
-  bool alltoallDisable;            // RCCL AllToAll/Scatter/Gather API
-  CliqueManager* cliqueManager;    // CliqueManager handles pointer collection / distribution for clique-based kernels
-  int rootPid;                     // Process ID of root
-  // [/RCCL]
-
+  // RCCL AllToAll/Scatter/Gather API
+  bool alltoallDisable;
 };
 
 #endif