leaf: Configure custom DSU URL

* Includes both LeafOS as well as AOSP GSIs

Change-Id: Ibfd6985123fb9968e5a70edc505794968a4d08be
diff --git a/config/common.mk b/config/common.mk
index c9cc277..83b8427 100644
--- a/config/common.mk
+++ b/config/common.mk
@@ -65,6 +65,10 @@
     SystemUI \
     Launcher3QuickStep
 
+# DSU
+PRODUCT_PRODUCT_PROPERTIES += \
+    persist.sys.fflag.override.settings_dynamic_system.list=https://get.leafos.org/dsu/
+
 # Enforce privapp-permissions whitelist
 PRODUCT_SYSTEM_DEFAULT_PROPERTIES += \
     ro.control_privapp_permissions=enforce