improve dumpsys SurfaceFlinger output

we now output the handle and size of all buffers of each layer.

Change-Id: I8d011ee4ae9199f4198bd07bed770ec3bcf02986
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index 383c045..505c843 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -533,7 +533,7 @@
     }
     snprintf(buffer, SIZE,
             "      "
-            "format=%2d, activeBuffer=[%3ux%3u:%3u,%3u],"
+            "format=%2d, activeBuffer=[%4ux%4u:%4u,%3X],"
             " freezeLock=%p, queued-frames=%d\n",
             mFormat, w0, h0, s0,f0,
             getFreezeLock().get(), mQueuedFrames);