Uprev packages in release builder config for firmware branch.

For firmware branch, release builders can bypass preflight queue
and pick up changes immediately.

Avoid building tests for firmware builds

BUG=none
TEST=cbuildbot_config_unittest.py

Change-Id: I7a1b0dbe0d4eae501d6eec30e28485c7453be910
Reviewed-on: https://gerrit.chromium.org/gerrit/14545
Reviewed-by: Anush Elangovan <anush@chromium.org>
Commit-Ready: Puneet Kumar <puneetster@chromium.org>
Reviewed-by: Puneet Kumar <puneetster@chromium.org>
Tested-by: Puneet Kumar <puneetster@chromium.org>
diff --git a/buildbot/cbuildbot_config.py b/buildbot/cbuildbot_config.py
index 46cca23..e82c078 100644
--- a/buildbot/cbuildbot_config.py
+++ b/buildbot/cbuildbot_config.py
@@ -651,11 +651,23 @@
 add_config('stumpy-release', [internal, full, official, release, {
   'board' : 'stumpy',
   'push_image': False,
+  'uprev' : True,
+  'overlays': 'both',
+  'build_tests' : False,
+  'unittests' : False,
+  'vm_tests' : False,
+  'prebuilts' : False,
 }])
 
 add_config('lumpy-release', [internal, full, official, release, {
   'board' : 'lumpy',
   'push_image': False,
+  'uprev' : True,
+  'overlays': 'both',
+  'build_tests' : False,
+  'unittests' : False,
+  'vm_tests' : False,
+  'prebuilts' : False,
 }])
 
 add_config('lumpy-pre-flight-branch', [internal, {