More renames for API council

Renames PhoneTime[|Zone]Suggestion to TelephonyTime[|Zone]Suggestion.
Makes changes to generally avoid PHONE and use SLOT_INDEX or telephony
as appropriate for the usage. Removes telephony / phone from a few
variable names where it doesn't add value.

This commit also renames some remaining phoneId instances to slotIndex
which were missed when that rename happened.

Bug: 148842434
Test: treehugger
Change-Id: I4302e68082b802b75b53c02a9c9b1ae39dff6085