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/system_server.te b/private/system_server.te
index 67882ba..ebcc8f3 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -636,6 +636,7 @@
 set_prop(system_server, device_config_storage_native_boot_prop)
 set_prop(system_server, device_config_sys_traced_prop)
 set_prop(system_server, device_config_window_manager_native_boot_prop)
+set_prop(system_server, device_config_configuration_prop)
 
 # BootReceiver to read ro.boot.bootreason
 get_prop(system_server, bootloader_boot_reason_prop)