Use registered users in OWNERS files.

AOSP project owners should be registered in Gerrit Code Review.

Bug: 33166666
Test: default build targets
Change-Id: I62fe7b06ff9b404ae068b3749de904ba1e64d438
diff --git a/OWNERS b/OWNERS
index 96be169..3e17018 100644
--- a/OWNERS
+++ b/OWNERS
@@ -2,4 +2,5 @@
 srhines@google.com
 pirama@google.com
 chh@google.com
-android-llvm-dev+owners-review@google.com
+# mailing list cannot be a reviewer yet
+# android-llvm-dev+owners-review@google.com