BufferQueue: clean up buffer counting

This change is a clean up of some of the handling of the maximum number of
buffers that are allowed at once.  It mostly renames a few member variables and
methods, but it includes a couple small refactorings.

Change-Id: I9959310f563d09583548d4291e1050a7bbc7d87d
diff --git a/services/surfaceflinger/DisplayHardware/FramebufferSurface.cpp b/services/surfaceflinger/DisplayHardware/FramebufferSurface.cpp
index 6d33592..d601fca 100644
--- a/services/surfaceflinger/DisplayHardware/FramebufferSurface.cpp
+++ b/services/surfaceflinger/DisplayHardware/FramebufferSurface.cpp
@@ -93,7 +93,7 @@
         mBufferQueue->setDefaultBufferFormat(fbDev->format);
         mBufferQueue->setDefaultBufferSize(fbDev->width, fbDev->height);
         mBufferQueue->setSynchronousMode(true);
-        mBufferQueue->setBufferCountServer(NUM_FRAME_BUFFERS);
+        mBufferQueue->setDefaultMaxBufferCount(NUM_FRAME_BUFFERS);
     } else {
         ALOGE("Couldn't get gralloc module");
     }