Add owners for ZramWriteback

Change-Id: Ie70efc8a5afc842c2ef2a1b8235c1a908bb8e470
diff --git a/services/core/java/com/android/server/OWNERS b/services/core/java/com/android/server/OWNERS
index a9c38bc..76e0c13 100644
--- a/services/core/java/com/android/server/OWNERS
+++ b/services/core/java/com/android/server/OWNERS
@@ -4,3 +4,6 @@
 # Vibrator / Threads
 per-file VibratorService.java, DisplayThread.java = michaelwr@google.com
 per-file VibratorService.java, DisplayThread.java = ogunwale@google.com
+
+# Zram writeback
+per-file ZramWriteback.java = minchan@google.com, rajekumar@google.com, srnvs@google.com