Adds apex available for security export aconfig flag

The wifi mainline module needs to check the flag before using
AAPM's api. Add apex dependency for wifi mainline module.

Flag: EXEMPT adds apex dependency in Android.bp file
Bug: 362586268
Test: TH
Change-Id: I9e9c3402ed872bfbb1b6ebbafda2a760082bdfe9
diff --git a/AconfigFlags.bp b/AconfigFlags.bp
index 6393fdb..269806e 100644
--- a/AconfigFlags.bp
+++ b/AconfigFlags.bp
@@ -373,6 +373,11 @@
     name: "android.security.flags-aconfig-java-export",
     aconfig_declarations: "android.security.flags-aconfig",
     mode: "exported",
+    min_sdk_version: "30",
+    apex_available: [
+        "//apex_available:platform",
+        "com.android.wifi",
+    ],
     defaults: ["framework-minus-apex-aconfig-java-defaults"],
 }