According Bluetooth device type to get icon

- Change getIcon() type from int to Drawable
- According Bluetooth device type to get icon
  e.g: fast pair device, hearing aid device, a2dp device

Bug: 128570540
Test: make -j42 RunSettingsLibRoboTests
Change-Id: I662e31958f6102c1c83b2de9112bf8967c8efbbc
6 files changed