Pass --quiet to retrace

Change-Id: I7ffe81b41de6dc911bc41eb091c306067f8d30ac
diff --git a/tools/retrace.py b/tools/retrace.py
index 41b5a06..b0a1ec8 100755
--- a/tools/retrace.py
+++ b/tools/retrace.py
@@ -107,6 +107,9 @@
     map_path
   ]
 
+  if quiet:
+    retrace_args.append('--quiet')
+
   if stacktrace:
     retrace_args.append(stacktrace)