WifiController: remove wifi inactive code

Wifi no longer will enter an enabled, but inactive, state.  This CL
removes the unused code that creates the inactive states, checks for
transitions and the code to get settings values related to wifi
idle/inactive.

A follow-on CL will merge the DeviceActiveState in to StaEnabledState.

Bug: 71513253
Test: frameworks/opt/net/wifi/tests/wifitests/runtests.sh
Test: wifi integration tests
Change-Id: Ie357987d47a055c0ed031ffba942658b2e723de4
4 files changed