Sync from tflite-micro. (tensorflow#181)

Author: TFLM-bot

src/tensorflow/lite/micro/kernels/micro_ops.h

@@ -113,6 +113,7 @@ TfLiteRegistration Register_TRANSPOSE();
 TfLiteRegistration Register_TRANSPOSE_CONV();
 // TODO(b/230666079): resolve conflict with xtensa implementation
 TfLiteRegistration Register_UNIDIRECTIONAL_SEQUENCE_LSTM();
+TfLiteRegistration Register_UNPACK();
 TfLiteRegistration Register_VAR_HANDLE();
 TfLiteRegistration Register_WHILE();
 TfLiteRegistration Register_ZEROS_LIKE();
@@ -130,7 +131,6 @@ TfLiteRegistration Register_RSQRT();
 TfLiteRegistration Register_SIN();
 TfLiteRegistration Register_SQRT();
 TfLiteRegistration Register_SQUARE();
-TfLiteRegistration Register_UNPACK();
 TfLiteRegistration Register_L2_NORMALIZATION();
 TfLiteRegistration Register_TANH();
 

src/tensorflow/lite/micro/kernels/unpack.cpp

@@ -1,4 +1,4 @@
-/* Copyright 2019 The TensorFlow Authors. All Rights Reserved.
+/* Copyright 2023 The TensorFlow Authors. All Rights Reserved.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -21,9 +21,7 @@ limitations under the License.
 #include "tensorflow/lite/micro/micro_log.h"
 
 namespace tflite {
-namespace ops {
-namespace micro {
-namespace unpack {
+
 namespace {
 
 constexpr int kInputTensor = 0;
@@ -100,13 +98,11 @@ TfLiteStatus Eval(TfLiteContext* context, TfLiteNode* node) {
 
   return kTfLiteOk;
 }
+
 }  // namespace
-}  // namespace unpack
 
 TfLiteRegistration Register_UNPACK() {
-  return tflite::micro::RegisterOp(nullptr, nullptr, unpack::Eval);
+  return tflite::micro::RegisterOp(nullptr, nullptr, Eval);
 }
 
-}  // namespace micro
-}  // namespace ops
 }  // namespace tflite

src/tensorflow/lite/micro/micro_mutable_op_resolver.h

@@ -554,8 +554,7 @@ class MicroMutableOpResolver : public MicroOpResolver {
   }
 
   TfLiteStatus AddUnpack() {
-    return AddBuiltin(BuiltinOperator_UNPACK,
-                      tflite::ops::micro::Register_UNPACK(), ParseUnpack);
+    return AddBuiltin(BuiltinOperator_UNPACK, Register_UNPACK(), ParseUnpack);
   }
 
   TfLiteStatus AddUnidirectionalSequenceLSTM() {