message: Fix the hifimini build.
  broke the hifimini
  build and is the reason why the Xtensa build badge is currently red.
  This change fixes the hifimini build.
  Manually tested that all the tests pass with:
  ```
  make -f tensorflow/lite/micro/tools/make/Makefile TARGET=xtensa OPTIMIZED_KERNEL_DIR=xtensa TARGET_ARCH=hifimini XTENSA_CORE=mini1m1m_RG test -j8
  ```
diff: @@ -199,7 +199,7 @@ TfLiteStatus Eval(TfLiteContext* context, TfLiteNode* node) {
  auto* op_data = static_cast<OpData*>(node->user_data);
  if (input->type == kTfLiteInt8 && output->type == kTfLiteInt16) {
  - return Softmax(*op_data, tflite::micro::GetTensorShape(input),
  + return SoftmaxHifimini(*op_data, tflite::micro::GetTensorShape(input),
  tflite::micro::GetTensorData<int8_t>(input),
  tflite::micro::GetTensorShape(output),
  tflite::micro::GetTensorData<int16_t>(output));
  