Export flags used in FlaggedApi annotations

Before calling a flagged API, client code must check the value of the flag
which gates it. Those flags must be exported in order to be accessible from
containers other than the container where the flag and the API are hosted.

Bug: 320984775
Bug: 322839671

Test: m all_aconfig_declarations
Test: printflags --format='{fully_qualified_name}:{is_exported}' | grep true

Change-Id: I8e61f2237f301d44b97fd257c83d1c5e8cfc13c6
diff --git a/avf_flags.aconfig b/avf_flags.aconfig
index 8abb9ee..589d227 100644
--- a/avf_flags.aconfig
+++ b/avf_flags.aconfig
@@ -2,6 +2,7 @@
 
 flag {
   name: "avf_v_test_apis"
+  is_exported: true
   namespace: "virtualization"
   description: "Only purpose of this flag is to be used in @FlaggedApi in our V test apis"
   bug: "325441024"