[kernel] Add CC dart-kernel group to codereview settings.

BUG=
R=vegorov@google.com

Review URL: https://chromereviews.googleplex.com/439227013 .
diff --git a/pkg/kernel/codereview.settings b/pkg/kernel/codereview.settings
index 8997840..25a45b4 100644
--- a/pkg/kernel/codereview.settings
+++ b/pkg/kernel/codereview.settings
@@ -1,2 +1,3 @@
 CODE_REVIEW_SERVER: https://chromereviews.googleplex.com
 VIEW_VC: https://github.com/dart-lang/kernel/commit/
+CC_LIST: dart-kernel@google.com