Add DeviceConfig namespace for contacts provider

Bug: 129980402
Test: dumpsys-activity provider com.android.providers.contacts/.ContactsProvider2
Before and after:
$ adb shell device_config put contacts_provider use_strict_phone_number_comparison true

Change-Id: I3b1d8c9ca0c17eb11c6db4c3f2a46660b3cb0819
1 file changed