[Status Bar] Wifi: Add support for hotspot device types to repo.

This is needed for instant tether.

The device type isn't hooked up to the UI yet because the device type
icon should only be displayed in Quick Settings Internet Tile (not the
status bar) and the Internet Tile isn't yet hooked in to the new
pipeline.

Bug: 265342892
Bug: 293585143
Test: `adb shell am broadcast -a com.android.systemui.demo -e command
network -e wifi show -e hotspot {tablet/laptop/watch/etc}` -> verify
demo repo has hotspot info
Test: atest WifiRepositoryViaTrackerLibTest WifiNetworkModelTest

Change-Id: Ia121ea81717333addd6cf498100c34d3fcae2297