AclManager: Use callback for classic Role

Connection roles are static in LE, store it in the connection.

Connection roles change in classic, use the callback.

Tag: #gd-refactor
Bug: 145832107
Test: atest bluetooth_test_gd
Test: ./cert/run --host
Change-Id: I7dd8810b0cc07bdbe085f3cb3e999090cbab6c65