Allow system_server to set arm64 memtag property

Bug: 262763327
Bug: 244290023
Test: atest MtePolicyTest on user build
Test: manually with TestDPC
Change-Id: If1ed257fede6fa424604eed9775eb3a3b8365afe
diff --git a/private/system_server.te b/private/system_server.te
index 54ad242..1a19a77 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -762,6 +762,7 @@
 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, smart_idle_maint_enabled_prop)
+set_prop(system_server, arm64_memtag_prop)
 
 # Allow query ART device config properties
 get_prop(system_server, device_config_runtime_native_boot_prop)