SettingsLib: Disable USB debugging if USB signaling is off

* When developer options is turned
  off and on again,'USB debugging'
  should not be enabled if USB data
  signaling is disabled.

Manual testing:
* Disable USB data signaling
* Verify preferences are disabled
* Turn developer options off and on
* Verify preferences remain disabled

Bug: 180711035
Test: manual testing
      make RunSettingsLibRoboTests -j ROBOTEST_FILTER=EnableAdbPreferenceControllerTest
Change-Id: Ic667a8998de10f1cd8493806aa555e1b499b469f