Set cpuset from surfaceflinger.

SurfaceFlinger shouldn't be limited to little cores exclusively, as the
binder threads should be placed on big cores when they are in the
critical path for a RenderThread.

bug 25745866

Change-Id: I9fb65f6d951733f91b4735ff27018411b58b2bfb
diff --git a/services/surfaceflinger/surfaceflinger.rc b/services/surfaceflinger/surfaceflinger.rc
index 1d6e20f..2b4ea2a 100644
--- a/services/surfaceflinger/surfaceflinger.rc
+++ b/services/surfaceflinger/surfaceflinger.rc
@@ -3,4 +3,4 @@
     user system
     group graphics drmrpc readproc
     onrestart restart zygote
-    writepid /dev/cpuset/system-background/tasks /sys/fs/cgroup/stune/foreground/tasks
+    writepid /sys/fs/cgroup/stune/foreground/tasks