moblab: Update stable version to R53-8480.0.0

BUG=chromium:629981
TEST=None

Change-Id: Ie45408e1664c4b2f3796f4ced8757a6375e66f8f
Reviewed-on: https://chromium-review.googlesource.com/362413
Reviewed-by: Mohan Konduri <krk@chromium.org>
Reviewed-by: Simran Basi <sbasi@chromium.org>
Tested-by: Simran Basi <sbasi@chromium.org>
diff --git a/moblab_config.ini b/moblab_config.ini
index 720f862..008e10b 100644
--- a/moblab_config.ini
+++ b/moblab_config.ini
@@ -13,3 +13,8 @@
 
 [AUTOSERV]
 auto_start_servod: True
+
+[CROS]
+# In moblab, this paramater is empty and uses the image bucket by default.
+results_storage_server:
+stable_cros_version: R53-8480.0.0