Add preflight config for spring.

BUG=chrome-os-partner:17187
TEST=Unittests for cbuildbot

Change-Id: If93f30847723229f11818ca0a7ee571559f98b5f
Reviewed-on: https://gerrit.chromium.org/gerrit/41777
Reviewed-by: David James <davidjames@chromium.org>
Commit-Queue: Peter Mayo <petermayo@chromium.org>
Tested-by: Peter Mayo <petermayo@chromium.org>
diff --git a/buildbot/cbuildbot_config.py b/buildbot/cbuildbot_config.py
index 1626d4e..f940efd 100755
--- a/buildbot/cbuildbot_config.py
+++ b/buildbot/cbuildbot_config.py
@@ -895,6 +895,13 @@
   boards=['x86-alex'],
 )
 
+internal_pfq_branch.add_config('spring-pre-flight-branch',
+  arm,
+  master=True,
+  push_overlays=constants.BOTH_OVERLAYS,
+  boards=['daisy_spring'],
+)
+
 internal_arm_paladin = internal_paladin.derive(arm)
 
 internal_paladin.add_config('mario-paladin',