Include stack traces from keystore2 in bugreports on debuggable builds

This is needed to debug hangs in keystore2.

Bug: 186879912
Test: 'adb bugreport', then find the stack traces for keystore2 in the
      "VM TRACES JUST NOW" section of the main bugreport file.
Change-Id: I76b591efa6a66173babe2784fdb5f472ceb840f1
diff --git a/libs/dumputils/dump_utils.cpp b/libs/dumputils/dump_utils.cpp
index 8b3c3ad..b52ec39 100644
--- a/libs/dumputils/dump_utils.cpp
+++ b/libs/dumputils/dump_utils.cpp
@@ -46,6 +46,7 @@
 
 // Native processes to dump on debuggable builds.
 static const char* debuggable_native_processes_to_dump[] = {
+        "/system/bin/keystore2",
         "/system/bin/vold",
         NULL,
 };