Allow pm.archiving.enabled to be read by priv apps.

Test: Presubmit
Bug: 314160630
Change-Id: Ibf844ce8a44244d0791490ae6c5df91039f4e9a7
diff --git a/private/priv_app.te b/private/priv_app.te
index cadefe1..536c9d4 100644
--- a/private/priv_app.te
+++ b/private/priv_app.te
@@ -293,3 +293,6 @@
 
 # Allow priv apps to report off body events to keystore2.
 allow priv_app keystore:keystore2 report_off_body;
+
+# Allow priv_apps to check if archiving is enabled
+get_prop(priv_app, pm_archiving_enabled_prop)