Add gkasten@google.com to OWNERS for services/audioflinger

Test: CLs can be submitted
Change-Id: If65f54135dbd8b308a63fc0cc71ae5a52abd4558
diff --git a/services/audioflinger/OWNERS b/services/audioflinger/OWNERS
index 703e4d2..d02d9e0 100644
--- a/services/audioflinger/OWNERS
+++ b/services/audioflinger/OWNERS
@@ -1,3 +1,4 @@
 hunga@google.com
 jmtrivi@google.com
 mnaganov@google.com
+gkasten@google.com