Whitelist prop persist.device_config.configuration.

For system prop flags from DeviceConfig namespace "Configuration".

Test: Build and run on local device
Bug: 149420506

Change-Id: If4196b4bf231e7c52f98b92cc0031a08dad06120
diff --git a/private/property_contexts b/private/property_contexts
index cba09a5..9175d10 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -203,6 +203,7 @@
 persist.device_config.media_native.          u:object_r:device_config_media_native_prop:s0
 persist.device_config.storage_native_boot.   u:object_r:device_config_storage_native_boot_prop:s0
 persist.device_config.window_manager_native_boot. u:object_r:device_config_window_manager_native_boot_prop:s0
+persist.device_config.configuration. u:object_r:device_config_configuration_prop:s0
 
 # Properties that relate to legacy server configurable flags
 persist.device_config.global_settings.sys_traced u:object_r:device_config_sys_traced_prop:s0