Game Driver: allow statsd to ask gpuservice for stats

Bug: 123529932
Test: adb shell cmd stats pull-source <GpuStats source ID>
Change-Id: Idbe34b598c611322468d5fe2162311a72175e574
diff --git a/public/statsd.te b/public/statsd.te
index 41c4adc..85523ef 100644
--- a/public/statsd.te
+++ b/public/statsd.te
@@ -31,6 +31,7 @@
   binder_call(statsd, perfprofd)
 ')
 binder_call(statsd, system_server)
+binder_call(statsd, gpuservice)
 
 # Allow logd access.
 read_logd(statsd)