Game Driver Metrics: allow statsd to find GpuService

Bug: 123529932
Test: adb shell cmd stats pull-source <GpuStats source ID>
Change-Id: Iceb7f4e45661b6dd6e92a3815edbf345f434f9b6
diff --git a/public/statsd.te b/public/statsd.te
index 85523ef..8ba7f63 100644
--- a/public/statsd.te
+++ b/public/statsd.te
@@ -31,6 +31,9 @@
   binder_call(statsd, perfprofd)
 ')
 binder_call(statsd, system_server)
+
+# Allow statsd to interact with gpuservice
+allow statsd gpu_service:service_manager find;
 binder_call(statsd, gpuservice)
 
 # Allow logd access.