[res] Add a feature flag for android resources RRO fix

RROs targeting 'android' currently can't be enabled-disabled
dynamically as Framework resources have no overlayable
definition. This is a flag making it possible for the apps with
the corresponding permission

Bug: 364035303
Test: build
Flag: EXEMPT adds a new flag
Change-Id: Iadd9195a7dff878f9a399e5fa6e8c8bd4421a985
diff --git a/core/java/android/content/res/flags.aconfig b/core/java/android/content/res/flags.aconfig
index 0af2f25..e98fc0c 100644
--- a/core/java/android/content/res/flags.aconfig
+++ b/core/java/android/content/res/flags.aconfig
@@ -74,3 +74,12 @@
     description: "Feature flag for passing a dimension to create an frro"
     bug: "369672322"
 }
+
+flag {
+    name: "rro_control_for_android_no_overlayable"
+    is_exported: true
+    namespace: "resource_manager"
+    description: "Allow enabling and disabling RROs targeting android package with no overlayable"
+    bug: "364035303"
+}
+