Allow specifying address with AddHciConnection.

Bumble clients want more control over addresses in order to preserve
pairing information. The re-use of device ids is not sufficient
because it depends on the timing of device connection. Allow clients
to specify the BD_ADDR on device creation.

Bug: 294435861
Test: m root-canal
Change-Id: I829596b6b137b1ea190926181fd9645bd8aa8276