Add flag for optimizing the processing of posted media notifications

Flag: com.android.systemui.media_controls_posts_optimization
Bug: 358645640
Test: Build.
Change-Id: I73014bbd28c3b5c02f6730faa0110c815ee31251
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index 669aca9..a468f13 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -1083,6 +1083,13 @@
 }
 
 flag {
+  name: "media_controls_posts_optimization"
+  namespace: "systemui"
+  description: "Ignore duplicate media notifications posted"
+  bug: "358645640"
+}
+
+flag {
   namespace: "systemui"
   name: "enable_view_capture_tracing"
   description: "Enables view capture tracing in System UI."