[Output Switcher] Add preference route listing check

When there's a preference route exist, Output Switcher should ignore
sorting by own rule.
**Actual implementation under settinglib will happened in master branch
since it will integrate with new api in Media framework which only exist
in master branch.

Bug: b/257851968
Test: atest MediaOutputAdapterTest MediaOutputControllerTest MediaOutputBaseDialogTest MediaOutputDialogTest
Change-Id: I3ee037101f00aac9bf7fdf5a38dde2a677fc7350
Merged-In: I0445ecb0528fe090709e984a7d2165b6d901bd9c