Merge "Improve comment on EXTRA_CALL_RAT_TYPE." into mnc-dr-dev am: 8b86c76296 am: 48a0c3ae8d
am: e0eaa03307

* commit 'e0eaa03307f2327080becffab3245e33d674a1fe':
  Improve comment on EXTRA_CALL_RAT_TYPE.