Update OWNERS file

OWNERS file is updated to include codec_OWNERS from frameworks/av

Bug: 186901608
Test: Review

Change-Id: I3dde409beda0bbd1eef40e66a6299443d952149d
diff --git a/OWNERS b/OWNERS
index 229a641..c836410 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,4 +1,4 @@
-# Default code reviewers picked from top 3 or more developers.
-# Please update this list if you find better candidates.
+# owners for external/sonivox
+include platform/frameworks/av:/media/janitors/codec_OWNERS
 flim@google.com
 essick@google.com