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/flags_health_check.te b/private/flags_health_check.te
index c6785dd..db7f08f 100644
--- a/private/flags_health_check.te
+++ b/private/flags_health_check.te
@@ -34,6 +34,7 @@
 set_prop(flags_health_check, device_config_remote_key_provisioning_native_prop)
 set_prop(flags_health_check, device_config_camera_native_prop)
 set_prop(flags_health_check, device_config_tethering_u_or_later_native_prop)
+set_prop(flags_health_check, device_config_mmd_native_prop)
 set_prop(flags_health_check, next_boot_prop)
 
 allow flags_health_check server_configurable_flags_data_file:dir rw_dir_perms;