message: Add space_to_batch_nd.h to makefile
diff: @@ -431,6 +431,7 @@ tensorflow/lite/kernels/internal/reference/requantize.h \
  tensorflow/lite/kernels/internal/reference/resize_nearest_neighbor.h \
  tensorflow/lite/kernels/internal/reference/round.h \
  tensorflow/lite/kernels/internal/reference/softmax.h \
  +tensorflow/lite/kernels/internal/reference/space_to_batch_nd.h \
  tensorflow/lite/kernels/internal/reference/sub.h \
  tensorflow/lite/kernels/internal/reference/logistic.h \
  tensorflow/lite/kernels/internal/reference/strided_slice.h \
  