Add CTS tests for missing API calls

1) TelephonyManager#resetSettings - Modifies data enabled
and ensures resetSettings resets it to the default.
2) ImsFeature#getSlotIndex - Ensures that an ImsFeature
created during the tests matches the correct test slot index.

Fixes: 154861678
Fixes: 154861678
Test: atest CtsTelephonyTestCases:TelephonyManagerTest CtsTelephonyTestCases:ImsServiceTest
Change-Id: I1c3e48f054df1788efb20af31e9d797c94e96cd6
2 files changed