Merge "Improve comment on EXTRA_CALL_RAT_TYPE." into mnc-dr-dev am: 8b86c76296 am: 48a0c3ae8d am: e0eaa03307
am: 6ebf6a27a7

* commit '6ebf6a27a772f3a21b575aaa88df46f773934214':
  Improve comment on EXTRA_CALL_RAT_TYPE.