message: SQUEEZE operator's input can be nullptr.
  When num_squeeze_dims is zero the data pointer should be nullptr.
  This addresses the following error when running NNAPIDelegate.SqueezeSimpleTest:
  ANeuralNetworksModel_setOperandValue setting operand 1 which has operand type that is not fully specified
diff: @@ -648,7 +648,7 @@ class NNAPIDelegateKernel {
  // Note that we add the squeeze dimensions even if the dimensions
  // were unspecified (empty), as NNAPI requires the operand.
  mapping_args.builder->AddVectorInt32Operand(
  - builtin->squeeze_dims,
  + builtin->num_squeeze_dims ? builtin->squeeze_dims : nullptr,
  static_cast<uint32_t>(builtin->num_squeeze_dims));
  return ANEURALNETWORKS_SQUEEZE;
  };
  