Grant dumpstate hwservermanager list permission

This lets dumpstate obtain the list of currently registered HwBinder
services.

Test: adb bugreport -- no denials to do with dumpstate access to
      hwservicemanager list functionality.
Bug: 37554633

Change-Id: I95512168948ca45a0dd830c20922e3c776ffaf41
diff --git a/public/dumpstate.te b/public/dumpstate.te
index 587156f..4bbef2c 100644
--- a/public/dumpstate.te
+++ b/public/dumpstate.te
@@ -174,6 +174,7 @@
 
 allow dumpstate { service_manager_type -gatekeeper_service -dumpstate_service -incident_service -virtual_touchpad_service -vr_hwc_service }:service_manager find;
 allow dumpstate servicemanager:service_manager list;
+allow dumpstate hwservicemanager:hwservice_manager list;
 
 allow dumpstate devpts:chr_file rw_file_perms;