Make malloc hook print a VLOG.

Change-Id: I092dbb9379225a6fa380a37e1ebc50ee61df40bd
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/aos/realtime.cc b/aos/realtime.cc
index d08dd91..2f5e1d9 100644
--- a/aos/realtime.cc
+++ b/aos/realtime.cc
@@ -337,7 +337,9 @@
         has_malloc_hook = false;
       }
     } else {
-      RAW_LOG(INFO, "Replacing glibc malloc");
+      if (VLOG_IS_ON(1)) {
+        RAW_LOG(INFO, "Replacing glibc malloc");
+      }
       if (&malloc != &aos_malloc_hook) {
         has_malloc_hook = false;
       }