surfaceflinger: rename BufferLayer::mSurfaceFlingerConsumer

Rename mSurfaceFlingerConsumer to mConsumer now that the type is
BufferLayerConsumer.

Test: builds
Change-Id: I22026e3af9e51a5ab3abf2ac32f92b506a70328a
diff --git a/services/surfaceflinger/BufferLayer.h b/services/surfaceflinger/BufferLayer.h
index fbe6367..6b02f8c 100644
--- a/services/surfaceflinger/BufferLayer.h
+++ b/services/surfaceflinger/BufferLayer.h
@@ -170,7 +170,7 @@
     sp<IGraphicBufferProducer> getProducer() const;
 
 private:
-    sp<BufferLayerConsumer> mSurfaceFlingerConsumer;
+    sp<BufferLayerConsumer> mConsumer;
 
     // Check all of the local sync points to ensure that all transactions
     // which need to have been applied prior to the frame which is about to