Added a new set of permissions for DeviceConfig API.

Permissions READ_DEVICE_CONFIG and WRITE_DEVICE_CONFIG are required to
use DeviceConfig API. Actual checks for new permissions are not added
as we are waiting for gmscore to include them into manifest.

Also added "configurator" protection flag.

Test: atest FrameworksCoreTests:DeviceConfigTest
      atest FrameworksCoreTests:SettingsProviderTest
      atest SettingsProviderTest:DeviceConfigServiceTest
Bug:109919982
Bug:113100523
Bug:113101834
Bug:117663715
Change-Id: I66c256b57c5491201c6c7834620a287b6c81c23c