complete the int64 support of gpu batchnorm fold2 grad operation

mindspore/ccsrc/backend/kernel_compiler/gpu/quant/batchnorm_fold2_grad_gpu_kernel.h

@@ -114,7 +114,7 @@ class BatchNormFold2GradGpuKernel : public GpuKernel {
     channel_ = input_shape[1];
     height_ = input_shape[2];
     width_ = input_shape[3];
-    freeze_bn_ = GetValue<int32_t>(AnfAlgo::GetCNodePrimitive(kernel_node)->GetAttr("freeze_bn"));
+    freeze_bn_ = GetValue<int64_t>(AnfAlgo::GetCNodePrimitive(kernel_node)->GetAttr("freeze_bn"));
 
     InitSizeLists();
     return true;