message: Exclude flex-buffer based kernel from CHRE build
diff: # Remove flexbuffers library and detection postprocess kernel from chre build
  # due to string dependencies.
  EXCLUDED_CC_SRCS := \
  + tensorflow/lite/micro/kernels/circular_buffer.cc \
  tensorflow/lite/micro/kernels/detection_postprocess.cc \
  tensorflow/lite/micro/kernels/flexbuffers_generated_data.cc
  