Fix permission issue for widevine mediaservices.

Widevine provisioning was causing SELinux policy issues since we need to
provision Widevine through MediaDrm framework.

Test: presubmits
Change-Id: Ia9d070309e84599ed614bbf5ba35eed558f4d463
diff --git a/private/rkpd_app.te b/private/rkpd_app.te
index 9064e5d..21f9b0c 100644
--- a/private/rkpd_app.te
+++ b/private/rkpd_app.te
@@ -16,6 +16,10 @@
 # Grant access to the normal services that are available to all apps
 allow rkpdapp app_api_service:service_manager find;
 
+# Grant access to media.metrics service, needed for widevine. This
+# access is granted to all other apps already (e.g. untrusted_app_all).
+allow rkpdapp mediametrics_service:service_manager find;
+
 # Grant access to statsd
 allow rkpdapp statsmanager_service:service_manager find;
 binder_call(rkpdapp, statsd)