Add artifact logic for paygen_au_suite.

BUG=chromium:263132
TEST=Used
http://localhost:8080/stage?archive_url=gs://chromeos-releases/dev-channel/\
daisy/4461.0.0/payloads&artifacts=paygen_au_suite
Verified autotest control file got staged on local devserver.

Change-Id: I0a49cb0239b31c127678603f00ba9daa355a1592
Reviewed-on: https://gerrit.chromium.org/gerrit/63925
Tested-by: Chris Sosa <sosa@chromium.org>
Reviewed-by: Gilad Arnold <garnold@chromium.org>
Commit-Queue: Chris Sosa <sosa@chromium.org>
diff --git a/artifact_info.py b/artifact_info.py
index 1341bc2..8062251 100644
--- a/artifact_info.py
+++ b/artifact_info.py
@@ -39,6 +39,9 @@
 # AU Suite - The control files for the autotest autoupdate suite.
 AU_SUITE = 'au_suite'
 
+# AU Suite - The control files for the autotest autoupdate suite.
+PAYGEN_AU_SUITE = 'paygen_au_suite'
+
 #### Miscellaneous artifacts. ####
 
 # Firmware tarball.