Add "# COMPONENT" to libsrtp OWNERS file

See https://tinyurl.com/yxau5sc4 for context.

Bug: 977050
Change-Id: Ia32dc08e989b060959d77826522071d1700f0c23
diff --git a/OWNERS b/OWNERS
index a558678..8761d45 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,2 +1,4 @@
 mattdr@chromium.org
 phoglund@chromium.org
+
+# COMPONENT: Internals>WebRTC