Migrate to getNetworkSelectionStatus()

isNetworkEnabled() & isNetworkPermanentlyDisabled()
should not be formal APIs. Instead,
getNetworkSelectionStatus() with a set of constants
is sufficient as an API surface, and will be more
maintainable in the future.

Also fixed testOsuAccessPointSummary_showsProvisioningUpdates
that was previously broken.

Bug: 146046526
Test: atest FrameworksWifiApiTests SettingsLibTests
Test: make RunSettingsLibRoboTests -j40
Change-Id: I89ed4f0de0ce693bbf4f77be84f08b82a89037bb