tree 3ac873962aaff890748a9db9972cfe15f7efae46
parent 2966539634082504439fa7f919233817f459b552
author chen xu <fionaxu@google.com> 1538618829 -0700
committer chen xu <fionaxu@google.com> 1539295832 -0700

refactor data/voice roaming states

1. migrate set/get roamingType from ServiceState to
NetworkRegState.set/get roamingType
2. migrate set/get roamingStateFromRegstate from ServiceState
to NetworkRegState.regState
3. new System API for neworkRegistration.isRoaming().

Bug: 116127096
Test: ServiceStateTest, ServiceStateProviderTest

Change-Id: Ib89744089c98713819c8d313240d629ddb77d0bf