BufferQueue: Remove Bn version of create*

It turns out that there's no reason to have both I* and Bn* versions
of the createBufferQueue method, so I removed the Bn* version.

Change-Id: I66aeb09e10458ae540ddf1f38d2d0154ea8f315b
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index 7f2ee2a..58a3040 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -117,8 +117,8 @@
 
 void Layer::onFirstRef() {
     // Creates a custom BufferQueue for SurfaceFlingerConsumer to use
-    sp<BnGraphicBufferProducer> producer;
-    sp<BnGraphicBufferConsumer> consumer;
+    sp<IGraphicBufferProducer> producer;
+    sp<IGraphicBufferConsumer> consumer;
     BufferQueue::createBufferQueue(&producer, &consumer);
     mProducer = new MonitoredProducer(producer, mFlinger);
     mSurfaceFlingerConsumer = new SurfaceFlingerConsumer(consumer, mTextureName);