Sync from tflite-micro. (tensorflow#175)

Author: TFLM-bot

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

@@ -100,6 +100,7 @@ TfLiteRegistration Register_SLICE();
 TfLiteRegistration Register_SOFTMAX();
 TfLiteRegistration Register_SPACE_TO_BATCH_ND();
 TfLiteRegistration Register_SPACE_TO_DEPTH();
+TfLiteRegistration Register_SPLIT_V();
 TfLiteRegistration Register_SQUARED_DIFFERENCE();
 TfLiteRegistration Register_SQUEEZE();
 TfLiteRegistration Register_STRIDED_SLICE();
@@ -127,7 +128,6 @@ TfLiteRegistration Register_ROUND();
 TfLiteRegistration Register_RSQRT();
 TfLiteRegistration Register_SIN();
 TfLiteRegistration Register_SPLIT();
-TfLiteRegistration Register_SPLIT_V();
 TfLiteRegistration Register_SQRT();
 TfLiteRegistration Register_SQUARE();
 TfLiteRegistration Register_UNPACK();

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

@@ -1,4 +1,4 @@
-/* Copyright 2018 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.
@@ -22,9 +22,8 @@ limitations under the License.
 #include "tensorflow/lite/micro/micro_log.h"
 
 namespace tflite {
-namespace ops {
-namespace micro {
-namespace split_v {
+
+namespace {
 
 template <typename T>
 TfLiteStatus SplitImpl(TfLiteContext* context, TfLiteNode* node,
@@ -119,12 +118,10 @@ TfLiteStatus Eval(TfLiteContext* context, TfLiteNode* node) {
   return kTfLiteOk;
 }
 
-}  // namespace split_v
+}  // namespace
 
 TfLiteRegistration Register_SPLIT_V() {
-  return tflite::micro::RegisterOp(nullptr, split_v::Prepare, split_v::Eval);
+  return tflite::micro::RegisterOp(nullptr, Prepare, Eval);
 }
 
-}  // namespace micro
-}  // namespace ops
 }  // namespace tflite

src/tensorflow/lite/micro/micro_mutable_op_resolver.h

@@ -497,8 +497,7 @@ class MicroMutableOpResolver : public MicroOpResolver {
   }
 
   TfLiteStatus AddSplitV() {
-    return AddBuiltin(BuiltinOperator_SPLIT_V,
-                      tflite::ops::micro::Register_SPLIT_V(), ParseSplitV);
+    return AddBuiltin(BuiltinOperator_SPLIT_V, Register_SPLIT_V(), ParseSplitV);
   }
 
   TfLiteStatus AddSqueeze() {