Allow dumpstate to call gpuservice over binder

This prevents denials while taking a bugreport.

Bug: 116711254
Test: cts-tradefed run cts -m CtsSecurityHostTestCases -t
android.security.cts.SELinuxHostTest#testNoBugreportDenials

Change-Id: I65dffda9806e0d627978ffdd392e3deb625149b7

private/dumpstate.te

@@ -28,6 +28,9 @@ binder_call(dumpstate, storaged)
 # Allow dumpstate to make binder calls to statsd
 binder_call(dumpstate, statsd)
 
+# Allow dumpstate to talk to gpuservice over binder
+binder_call(dumpstate, gpuservice);
+
 # Collect metrics on boot time created by init
 get_prop(dumpstate, boottime_prop)