Wifi Settings: Add auto option for softap

For device with 5g support, settings will display auto, 2g, and 5g options.
For decice without 5g support, auto and 2g option are shown.

Bug: 68763822
Test: compile
Test: m RunSettingsRoboTests -j40
Test: manually test by checking UI and start hotspot with no issue
Test: manually test that wifi settings logs expected values

Change-Id: Iee9f8cff6aa48df80f5c228596cd9a14f884c274