Add "Speed & compatibility" preference to Wi-Fi hotspot Settings

- Show 4 speed types in summary
  - 2.4 Ghz
  - 5 Ghz
  - 2.4 and 5 GHz
  - 6 GHz

Bug: 245258763
Test: manual test
atest -c WifiTetherViewModelTest
atest -c WifiHotspotRepositoryTest
make RunSettingsRoboTests ROBOTEST_FILTER=WifiTetherSettingsTest

Change-Id: I6deb41cb355b0ceb1f1fd2d84408a83b90433e7d