Add READ_DEVICE_CONFIG permission check to DeviceConfig API.

Test: atest FrameworksCoreTests:DeviceConfigTest
      atest FrameworksCoreTests:SettingsProviderTest
      atest SettingsProviderTest:DeviceConfigServiceTest

Bug:117663715
Change-Id: I04226876ddf910945bf343d25fa3dd04ba8eab31
2 files changed