Update strings in special app access and dev options

- Change all yes/no or on/off strings in special app access to
  Allowed/Not allowed
- Remove some dead code in related files
- Add a toast string in DevelopmentSettingsDisabledActivity to prompt
  user enable dev options before use.
- Add search in SpecialAccessSettings

Change-Id: I8b2535e037a86e76bdbcd3fb6e1cf2e0347bedbf
Fix: 38290299
Fix: 37469224
Test: make RunSettingsRoboTests