Add hwtests for peach_pi.

TEST=pylint.
BUG=None

Change-Id: Ief296f330b4813f81c2283b2e92478145cf0eb21
Previous-Reviewed-on: https://chromium-review.googlesource.com/190586
(cherry picked from commit 52f318995765d63207d55287916fc314af7dd750)
Reviewed-on: https://chromium-review.googlesource.com/191264
Commit-Queue: Prashanth B <beeps@chromium.org>
Tested-by: Prashanth B <beeps@chromium.org>
Reviewed-by: Katie Roberts-Hoffman <katierh@chromium.org>
diff --git a/buildbot/cbuildbot_config.py b/buildbot/cbuildbot_config.py
index 4871cb8..1c0d338 100755
--- a/buildbot/cbuildbot_config.py
+++ b/buildbot/cbuildbot_config.py
@@ -1960,7 +1960,6 @@
 
 _arm_release.add_config('peach_pi-release',
   boards=['peach_pi'],
-  hw_tests=[],
 )
 
 _arm_release.add_config('nyan_big-release',