Add jdduke@ to services/proguard.flags OWNERS

This file is only used in optional optimized builds, and will likely
undergo significant churn in the coming weeks. Add jdduke@ as an
OWNER for this file only to help expedite review.

Bug: 210510433
Change-Id: I46d3dfa2d3fc56acd849aa93e3361ac3af5c1341
Test: N/A
diff --git a/services/OWNERS b/services/OWNERS
index b3bf5dc..9b5f0e7 100644
--- a/services/OWNERS
+++ b/services/OWNERS
@@ -5,3 +5,5 @@
 
 per-file java/com/android/server/* = patb@google.com
 per-file tests/servicestests/src/com/android/server/systemconfig/* = patb@google.com
+
+per-file proguard.flags = jdduke@google.com