Handle conflicts in avct browse

Conflicts were handled in avct control but not in browse,
this would result in control connected but browse rejecting
incoming connections continuously.

Adding the same conflict handling mechanism in browse as in
control.

Bug: 285621447
Tag: #stability
Test: m libbt-bta
Test: Manual connect/disconnect with AA device
Test: atest bt_host_test_bta
Change-Id: I68df2f87cb39baadb398decde87e61d886f148b8