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/property_contexts b/private/property_contexts
index eab1e86..6b825cb 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -305,6 +305,7 @@
 persist.device_config.memory_safety_native_boot.    u:object_r:device_config_memory_safety_native_boot_prop:s0
 persist.device_config.memory_safety_native.         u:object_r:device_config_memory_safety_native_prop:s0
 persist.device_config.tethering_u_or_later_native.  u:object_r:device_config_tethering_u_or_later_native_prop:s0
+persist.device_config.mmd_native.                   u:object_r:device_config_mmd_native_prop:s0
 
 # Prop indicates the apex that bundles input configuration files (*.idc,*.kl,*.kcm)
 input_device.config_file.apex    u:object_r:input_device_config_prop:s0 exact string
@@ -1778,4 +1779,5 @@
 trusty.security_vm.keymint.enabled u:object_r:trusty_security_vm_sys_vendor_prop:s0 exact bool
 
 # Properties for mmd
+mmd. u:object_r:mmd_prop:s0
 mmd.enabled_aconfig u:object_r:mmd_prop:s0 exact bool