Reduce log spam by changing a LOG(INFO) to VLOG(startup)

Bug: 17166556

(cherry picked from commit b6cabc1345ec307559a6e85141fb69b7caa9413c)

Change-Id: I9975ba07ad8f119a6e367e2770a60040a462149b
diff --git a/runtime/gc/space/image_space.cc b/runtime/gc/space/image_space.cc
index 0139ecc..416c267 100644
--- a/runtime/gc/space/image_space.cc
+++ b/runtime/gc/space/image_space.cc
@@ -362,8 +362,8 @@
       // we leave Create.
       ScopedFlock image_lock;
       image_lock.Init(image_filename->c_str(), error_msg);
-      LOG(INFO) << "Using image file " << image_filename->c_str() << " for image location "
-                << image_location;
+      VLOG(startup) << "Using image file " << image_filename->c_str() << " for image location "
+                    << image_location;
       // If we are in /system we can assume the image is good. We can also
       // assume this if we are using a relocated image (i.e. image checksum
       // matches) since this is only different by the offset. We need this to