Downgrade relatively spammy log to verbose.

Test: logcat
Change-Id: I818a2fa84ba318c338c06525add77d5b31a68bb3
diff --git a/services/surfaceflinger/BufferLayerConsumer.cpp b/services/surfaceflinger/BufferLayerConsumer.cpp
index 7d2dcba..cc78ece 100644
--- a/services/surfaceflinger/BufferLayerConsumer.cpp
+++ b/services/surfaceflinger/BufferLayerConsumer.cpp
@@ -496,7 +496,7 @@
 
 BufferLayerConsumer::Image::~Image() {
     if (mGraphicBuffer != nullptr) {
-        ALOGE("Destroying buffer: %" PRId64, mGraphicBuffer->getId());
+        ALOGV("Destroying buffer: %" PRId64, mGraphicBuffer->getId());
         mRE.unbindExternalTextureBuffer(mGraphicBuffer->getId());
     }
 }