composer: route binder traffic over vndbinder

b/36683636 Hwcomposer is starting binder threads

Test: sailfish

Change-Id: I28ad19b5036c6fbf514770369888ca11892bf212
Signed-off-by: Iliyan Malchev <malchev@google.com>
diff --git a/graphics/composer/2.1/default/service.cpp b/graphics/composer/2.1/default/service.cpp
index 712dac1..aa0604a 100644
--- a/graphics/composer/2.1/default/service.cpp
+++ b/graphics/composer/2.1/default/service.cpp
@@ -28,6 +28,7 @@
 
 int main() {
     // the conventional HAL might start binder services
+    android::ProcessState::initWithDriver("/dev/vndbinder");
     android::ProcessState::self()->setThreadPoolMaxThreadCount(4);
     android::ProcessState::self()->startThreadPool();