1. Unhide MSIM APIs in TelephonyManager that already have non-MSIM equivalent
APIs public.
2. Make MSIM API naming consistent (overloaded, no suffix).
3. Unhide APIs in SubscriptionManager that are necessary for MSIM.
Bug: 26772894
Change-Id: Ibebab7379ea79c8e4812bbd190342827048e30e2