Enable hwtest for board peach_pit on R30 branch

BUG=chromium:286324
TEST=run cbuildbot_config_unittest.py

Change-Id: Ia6e87f9e9ed6f1e9191fa700828bb027d87d2500
Reviewed-on: https://chromium-review.googlesource.com/169673
Reviewed-by: John Dung Hong <johndhong@chromium.org>
Commit-Queue: Dan Shi <dshi@chromium.org>
Tested-by: Dan Shi <dshi@chromium.org>
diff --git a/buildbot/cbuildbot_config.py b/buildbot/cbuildbot_config.py
index dcdaacf..4a87ca0 100755
--- a/buildbot/cbuildbot_config.py
+++ b/buildbot/cbuildbot_config.py
@@ -1516,7 +1516,6 @@
 
 _arm_release.add_config('peach_pit-release',
   boards=['peach_pit'],
-  hw_tests=[],
 )
 
 # Factory and Firmware releases much inherit from these classes.  Modifications