fdtrack: emit the most common stack in the abort message.

Bug: http://b/181875562
Test: manual
Change-Id: I2826b148d55788e932fa04dcef33c78fad8be227
diff --git a/libfdtrack/libfdtrack.map.txt b/libfdtrack/libfdtrack.map.txt
index 7a23954..6c4015c 100644
--- a/libfdtrack/libfdtrack.map.txt
+++ b/libfdtrack/libfdtrack.map.txt
@@ -1,6 +1,7 @@
 LIBFDTRACK {
   global:
     fdtrack_dump;
+    fdtrack_dump_fatal;
     fdtrack_iterate;
   local:
     *;