[Aware] Add support utility for PeerHandle to MAC translation

Add a support API to be used between system services only: added
in support of RTT service which is provided with a PeerHandle but
needs the corresponding MAC address.

Bug: 65015034
Test: unit tests on service, integration tests with RTT
Change-Id: I6848acda9bfef306b8feaae6987ff18f7bc2e6ec