This CL tries to detect Bluetooth hearing aid devices and tries to
combine the entry of the hearing aids with the same HiSyncIds and
show only 1 entry for each pair in the connected devices list.
This CL also shows 2 battery status in the device details page.
This change shows the combined entry after a user returns to the
settings activity after pressing the back button or somehow
without killing it. It also combines the entries just after pairing.
Test: RunSettingsRoboTests
Bug: 74204427
Change-Id: I47fb0bdd96b1cc972d88a4aef85d0113985d63bb
35e217f91f