Add entrance for B&R sound related settings.
Bug: 278975761
Test: manual, need to open aconfig flag.
Change-Id: I5396e9e260aea1ece3a507ee322c73308f69f94a
Creating an no-op backup agent in settings. This ensures that
we get onRestoreFinished callback after restore is finished where we
can update all pinned shortcuts.
Bug: 110016648
Test: Verified backup->clear-data->restore path on device
Change-Id: Id14d0792d60ba08d97078a31a81d2b63ab8ce109