Add sepolicy for mmd system properties

mmd uses "mmd." and "persist.device_config.mmd_native." prefixed system
properties to configure itself.

Bug: 375431994
Test: manual

Change-Id: Idf7c8d4f1a314595cd75d494f8a55a3d26773514
diff --git a/private/system_server.te b/private/system_server.te
index aeeb566..a901466 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -816,6 +816,7 @@
 set_prop(system_server, device_config_memory_safety_native_prop)
 set_prop(system_server, device_config_remote_key_provisioning_native_prop)
 set_prop(system_server, device_config_tethering_u_or_later_native_prop)
+set_prop(system_server, device_config_mmd_native_prop)
 set_prop(system_server, smart_idle_maint_enabled_prop)
 set_prop(system_server, arm64_memtag_prop)
 
@@ -1397,6 +1398,7 @@
   device_config_aconfig_flags_prop
   device_config_window_manager_native_boot_prop
   device_config_tethering_u_or_later_native_prop
+  device_config_mmd_native_prop
   next_boot_prop
 }:property_service set;