message: revert DIV part
  revert div op part because there is semantic gap between tflite
  and nnapi.
diff: @@ -2040,16 +2040,9 @@ bool NNAPIDelegateKernel::Validate(
  ExpectOpVersion(version, 1, &val_ctx);
  ExpectMinAndroidSdkVersion(android_sdk_version, kMinSdkVersionForNNAPI11,
  &val_ctx);
  - const TfLiteType input_type =
  - context->tensors[node->inputs->data[0]].type;
  -
  - if (android_sdk_version >= kMinSdkVersionForNNAPI13) {
  - ExpectIsFloatOrInt32Operator(context, node, &val_ctx);
  - } else {
  - Expect(IsFloat(input_type),
  + Expect(context->tensors[node->inputs->data[0]].type == kTfLiteFloat32,
  NNAPIValidationFailureType::kUnsupportedInputType,
  "NNAPI only support float div.", &val_ctx);
  - }
  } break;
  case kTfLiteBuiltinPad:
  case kTfLiteBuiltinPadv2: {
  