Remove index tensor in avgpool (#1093)

* Remove index tensor

* fix syntax

---------
Co-authored-by: Illia Silin <98187287+illsilin@users.noreply.github.com>
Co-authored-by: illsilin <Illia.Silin@amd.com>

client_example/19_pool/avg_pool3d_fwd.cpp

@@ -94,7 +94,6 @@ int main(int argc, char* argv[])
 
     SimpleDeviceMem in_device_buf(sizeof(InDataType) * in_tensor_size);
     SimpleDeviceMem out_device_buf(sizeof(OutDataType) * out_tensor_size);
-    SimpleDeviceMem out_indices_device_buf(sizeof(IndexDataType) * out_tensor_size);
 
     using DeviceOp = ck::tensor_operation::device::DevicePoolFwd<InOutRank,
                                                                  WindowRank,
@@ -124,10 +123,10 @@ int main(int argc, char* argv[])
     for(int i = 0; i < op_ptrs.size(); ++i)
     {
         auto& op_ptr = op_ptrs[i];
-        auto argument_ptr = op_ptr->MakeArgumentPointer(
-            static_cast<InDataType*>(in_device_buf.GetDeviceBuffer()),
+        auto argument_ptr =
+            op_ptr->MakeArgumentPointer(static_cast<InDataType*>(in_device_buf.GetDeviceBuffer()),
                                         static_cast<OutDataType*>(out_device_buf.GetDeviceBuffer()),
-            static_cast<IndexDataType*>(out_indices_device_buf.GetDeviceBuffer()),
+                                        nullptr,
                                         in_length,
                                         window_spatial_lengths,
                                         out_length,
@@ -184,10 +183,10 @@ int main(int argc, char* argv[])
         std::cout << "Run the best instance without timing: " << op_ptr->GetTypeString()
                   << std::endl;
 
-        auto argument_ptr = op_ptr->MakeArgumentPointer(
-            static_cast<InDataType*>(in_device_buf.GetDeviceBuffer()),
+        auto argument_ptr =
+            op_ptr->MakeArgumentPointer(static_cast<InDataType*>(in_device_buf.GetDeviceBuffer()),
                                         static_cast<OutDataType*>(out_device_buf.GetDeviceBuffer()),
-            static_cast<IndexDataType*>(out_indices_device_buf.GetDeviceBuffer()),
+                                        nullptr,
                                         in_length,
                                         window_spatial_lengths,
                                         out_length,