Add two fixes for MuiltiSim support

Use getDefaultDataSubId to get default data network type. Currently using
getDefaultSubscription() may return voice network subId.

Provide database flags per subscription specific for both mobile data
and roaming options.

CRs-Fixed: 963773
Change-Id: I1d40bc5c84b4428d7066b28003e5b2c5d852b6f7
2 files changed