AudioService: BtHelper: supplementary fix for late BT profile connection

Commit 90420310 was incomplete in that it would not properly
differentiate LE output devices from LE input devices.
Also prevent from connecting 2 active devices for the same profile with
different addresses.

Bug: 328248404
Test: make
Change-Id: I4a4340fdea865304097e987361fc810420056d6f