Add set_k_partition function (#624)

A member function set_k_partition is required for the instatiation of cutlass::gemm::kernel::Gemm, even though SplitKSerial is false

include/cutlass/epilogue/thread/conversion_op.h

@@ -90,6 +90,12 @@ public:
   CUTLASS_HOST_DEVICE
   Convert(Params const &params = Params()) {
 
+  }
+  
+  /// Functionally required for serial reduction in the epilogue
+  CUTLASS_HOST_DEVICE
+  void set_k_partition(int k_partition, int k_partition_count) {
+    
   }
 
   /// Returns true if source is needed based on state of runtime arguments