Fix: policy enforcement for location wifi scanning

Make DISALLOW_CONFIG_LOCATION effectively disallow wifi scanning and
bluetooth scanning settings for location services.

screenshots: http://shortn/_EUOdqrOcnS, http://shortn/_j320QDm1Zo

Bug: 228315522
Bug: 228315529
Test: atest SettingsRoboTests, on device

Change-Id: I78291579a79e915a27ebdd051b3caf3fc04efc41
(cherry picked from commit fcae147f58be3b6441ce9e03bc59515af0d53ccc)
3 files changed