Use only registered users in piex/OWNERS.

AOSP project owners should be registered in Gerrit Code Review.

Bug: 33166666
Test: default build targets
Change-Id: I6af8cff8ec297bbf486459aff1d8da875b72d246
diff --git a/OWNERS b/OWNERS
index 64ff1f9..ed94b62 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,5 +1,3 @@
 adaubert@google.com
-ebrauer@google.com
-kinan@google.com
 mboehme@google.com
 yujieqin@google.com