Rename LeAddressManager#GetCurrentAddress()

There is misuse of this function since it's not clear whether it is the
initiator address, or the identity address. Renaming it should prevent
future misuse. The followup CL fixes the incorrect usage when possible.

We also rename GetAnotherAddress for similar reasons.

Bug: 268112598
Test: unit
Change-Id: Ia5640c02a452670f7dae85e9c8c0c8099da8159f