Add WRITE_DEVICE_CONFIG permission check to DeviceConfig API.

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

Bug:117663715
Change-Id: Iab7dd7959891ebc29fbbf773ce6ab28ba4e05f1d
1 file changed