Add philburk to OWNERS file for AudioFlinger

Change-Id: I399f32a5248c306cc888c34923cc8435fa5e7764
diff --git a/services/audioflinger/OWNERS b/services/audioflinger/OWNERS
index 034d161..17d4c37 100644
--- a/services/audioflinger/OWNERS
+++ b/services/audioflinger/OWNERS
@@ -1,4 +1,4 @@
-gkasten@google.com
 hunga@google.com
 jmtrivi@google.com
 mnaganov@google.com
+philburk@google.com