delete the log printing in layout autotune (#43677)

删除 layout autotune 中的多余打印
背景 ：layout autotune log会导致模型打印信息增多

paddle/fluid/imperative/layout_autotune.cc

@@ -25,7 +25,6 @@ namespace imperative {
 bool LayoutAutoTune::UseLayoutAutoTune() const {
 #if defined(PADDLE_WITH_CUDA)
   if (!phi::backends::gpu::TensorCoreAvailable()) {
-    LOG(INFO) << "Layout AutoTuning is not available.";
     return false;
   } else {
     return use_layout_autotune_;