Add a java host flag library for testing

Bug: 296465999
Test: use the flag
Change-Id: Id8de5f90d06647e020800aabf28bc67658dda331
diff --git a/AconfigFlags.bp b/AconfigFlags.bp
index fd92979b..ea2eaa0 100644
--- a/AconfigFlags.bp
+++ b/AconfigFlags.bp
@@ -80,6 +80,14 @@
     defaults: ["framework-minus-apex-aconfig-java-defaults"],
 }
 
+java_aconfig_library {
+    name: "android.security.flags-aconfig-java-host",
+    aconfig_declarations: "android.security.flags-aconfig",
+    host_supported: true,
+    test: true,
+    defaults: ["framework-minus-apex-aconfig-java-defaults"],
+}
+
 // OS
 aconfig_declarations {
     name: "android.os.flags-aconfig",