Separate voice/data roaming state and type

It is possible for voice and data to register on different networks so
that the roaming state for them could be different. Provide separated
APIs to handle voice and data roaming.

Also, add the configuration of CDMA international roaming indicators.

Bug: 17318123
Change-Id: Iede9132cbf94bc9971702bd9232374585edd5cd0
7 files changed