Telephony(MSIM): Add prompt support for SMS

1) Add prompt option in SMS multi sim settings.
2) New iterface API to get SMS prompt is enabled or not.
3) Disply prompt while sending SMS, if user selects
   prompt mode in multi sim settings.
CRs-fixed: 474694

Change-Id: I0b46dc05c50ca69a806613ecf2c5eae3964f043f
DSDS: Subscription specific for Mobile data, roaming and usage

1. Provide per subscription based support for both Mobile Data
   and Data roaming options. UI and functionality changes in:
   a. Settings -> Data Usage application
   b. Settings -> Mobile Networks menu

2. Provide per subscription based data usage information. UI and
   functionality changes in Settings -> Data Usage application.
CRs-Fixed: 503932

Change-Id: I8e0088dd5cb3de63f880ef02a9cf125f0d986009