Use TM SubId in getDataState and getDataActivity

-Update getDataState() API to use the SubId specified
 by the TelephonyManager instance.

-Update the getDataActivity() API to use the SubId
 specified by the TelephonyManager instance.

Bug: 135205433
Test: manual (automated test is infeasible)
Change-Id: Icf27eab40b1f979892123dc4185db2a138c1ffc2