Added read only suspend hal properties

Bug: 170587692
Test: Inspected logs to confirm android.system.suspend can access the
properties

Change-Id: Ie6a84afe490df0d2b11ff4f06588c7bca68d9850
diff --git a/private/property.te b/private/property.te
index bf73c3d..10cfb49 100644
--- a/private/property.te
+++ b/private/property.te
@@ -16,6 +16,7 @@
 system_internal_prop(netd_stable_secret_prop)
 system_internal_prop(pm_prop)
 system_internal_prop(system_adbd_prop)
+system_internal_prop(suspend_prop)
 system_internal_prop(traced_perf_enabled_prop)
 system_internal_prop(userspace_reboot_log_prop)
 system_internal_prop(userspace_reboot_test_prop)
@@ -284,6 +285,13 @@
   } {
     wifi_prop
   }:file no_rw_file_perms;
+
+  neverallow {
+    domain
+    -init
+  } {
+    suspend_prop
+  }:property_service set;
 ')
 
 compatible_property_only(`