message: [tflite] fix allow fp16 in_tflite benchmark model
  interpreter_->SetAllowFp16PrecisionForFp32() should be called
  before setting delegate
diff: @@ -428,6 +428,7 @@ void BenchmarkTfLiteModel::Init() {
  }
  interpreter_->UseNNAPI(params_.Get<bool>("use_legacy_nnapi"));
  + interpreter_->SetAllowFp16PrecisionForFp32(params_.Get<bool>("allow_fp16"));
  delegates_ = GetDelegates();
  for (const auto& delegate : delegates_) {
  @@ -439,7 +440,6 @@ void BenchmarkTfLiteModel::Init() {
  }
  }
  - interpreter_->SetAllowFp16PrecisionForFp32(params_.Get<bool>("allow_fp16"));
  auto interpreter_inputs = interpreter_->inputs();
  