Add WiFi toggle prompts - settings

If permission review is enabled toggling WiFi on or off
results in a user prompt to collect a consent. This applies
only to legacy apps, i.e. ones that don't support runtime
permissions as they target SDK 22.

Bug: 28715749
Test: Unit tests
Change-Id: I10d1231ea0c47eec5993dbe367cc0c245cba9385
Merged-In: I10d1231ea0c47eec5993dbe367cc0c245cba9385