Add Instant Tether network icon

- Add hotspot device type icons without signal strength
  - DEVICE_TYPE_PHONE
  - DEVICE_TYPE_TABLET
  - DEVICE_TYPE_LAPTOP
  - DEVICE_TYPE_WATCH
  - DEVICE_TYPE_AUTO

Bug: 268550769
Bug: 290805980
Test: manual test
make RunSettingsLibRoboTests ROBOTEST_FILTER=WifiUtilsTest

Change-Id: I02f9c5e5168cb353cf87b9d76576024d9a038bc3