message: Fix compile error for the mbed target for Tensorflow Lite Micro.
  Add pooling.h to the list of files to be copied when building Tensorflow
  Lite Micro for Mbed OS. Also add conv.h to the same list.
diff: @@ -106,9 +106,11 @@ tensorflow/lite/kernels/op_macros.h \
  tensorflow/lite/kernels/padding.h \
  tensorflow/lite/kernels/internal/common.h \
  tensorflow/lite/kernels/internal/compatibility.h \
  +tensorflow/lite/kernels/internal/reference/conv.h \
  tensorflow/lite/kernels/internal/reference/depthwiseconv_float.h \
  tensorflow/lite/kernels/internal/reference/depthwiseconv_uint8.h \
  tensorflow/lite/kernels/internal/reference/fully_connected.h \
  +tensorflow/lite/kernels/internal/reference/pooling.h \
  tensorflow/lite/kernels/internal/reference/softmax.h \
  tensorflow/lite/kernels/internal/round.h \
  tensorflow/lite/kernels/internal/tensor_ctypes.h \
  