Add flag to change to the new APN page.

Fix: 300203760

Test: Visual
Change-Id: I0f869fb847f0a108487eb84509a736129fe42223
diff --git a/aconfig/Android.bp b/aconfig/Android.bp
index edfe0a9..d4960c2 100644
--- a/aconfig/Android.bp
+++ b/aconfig/Android.bp
@@ -8,6 +8,7 @@
     srcs: [
         "settings_connecteddevice_flag_declarations.aconfig",
         "settings_globalintl_flag_declarations.aconfig",
+        "settings_apn_flag_declarations.aconfig",
     ],
 }