Revert "Revert "Put pm.* property in new pm_prop context""

This reverts commit 248b6dc64444ea3260fba8e9cb390e59e2b941ab.

Reason for revert: The dashboard complains that devices don't boot after this revert.

Change-Id: I6a4648b64b096cbaa97c67aae6bc38b76d54cb48
diff --git a/private/system_server.te b/private/system_server.te
index b38509c..93c6a57 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -481,6 +481,7 @@
 set_prop(system_server, device_logging_prop)
 set_prop(system_server, dumpstate_options_prop)
 set_prop(system_server, overlay_prop)
+set_prop(system_server, pm_prop)
 userdebug_or_eng(`set_prop(system_server, wifi_log_prop)')
 
 # ctl interface