[RTT2] RTT Responder config mods to meet API requirements

RTT Responder members are final: create an intermediate duplicate
object to represent Responders which use PeerHandle with both a MAC
address and a PeerHandle specified:
- The HAL will use the MAC address
- The Service will use the presence of a PeerHandle to indicate that
  the result's MAC address should be stripped off and replaced with
  the PeerHandle

Bug: 65108607
Test: unit tests, integration tests
Change-Id: I56c0b1c529536155ed43a183accea5a75a09388b
1 file changed