Add support in Xtensa variant of Quantize op for int8 to int16 (#888)
Add support in Xtensa variant of Quantize op for int8 to int16 (#888)

* Add support in Xtensa variant of Quantize op for int8 to int16
quantization

BUG=209926304

* Format to please the code style checker.

Co-authored-by: Ting Yan <425a412c654421fbc8df9410fe1738fe72e4ae45@users.noreply.github.com>
tensorflow/tflite-micro,tensorflow/tflite-micro,tensorflow/tflite-micro,tensorflow/tflite-micro