message: Fix quantize kernel to prepare quantization for int16->int32 requant.
  Previously the kernel would run but quantized multiplier and shift were not generated properly during Prepare.
diff: @@ -70,9 +70,10 @@ TfLiteStatus Prepare(TfLiteContext* context, TfLiteNode* node) {
  output->type == kTfLiteInt16 ||
  output->type == kTfLiteInt32);
  - if (((input->type == kTfLiteInt16 || input->type == kTfLiteInt8) &&
  - output->type == kTfLiteInt8) ||
  - (input->type == kTfLiteInt16 && output->type == kTfLiteInt16)) {
  + if ((input->type == kTfLiteInt16 && output->type == kTfLiteInt8) ||
  + (input->type == kTfLiteInt8 && output->type == kTfLiteInt8) ||
  + (input->type == kTfLiteInt16 && output->type == kTfLiteInt16) ||
  + (input->type == kTfLiteInt16 && output->type == kTfLiteInt32)) {
  double effective_scale = static_cast<double>(input->params.scale) /
  static_cast<double>(output->params.scale);
  