Use java_aconfig_library for nearby and thread flags

Connectivity repo now can use java_aconfig_library since this target is
available on all downstream branches.

Bug: 345121279
Test: TH
Change-Id: I6d267ddac89731a8efbef2ee98a3baa1df754ff5
diff --git a/nearby/framework/Android.bp b/nearby/framework/Android.bp
index 41a28a0..f84ddcf 100644
--- a/nearby/framework/Android.bp
+++ b/nearby/framework/Android.bp
@@ -54,6 +54,7 @@
     ],
     static_libs: [
         "modules-utils-preconditions",
+        "com.android.nearby.flags-aconfig-java",
     ],
     visibility: [
         "//packages/modules/Connectivity/nearby/tests:__subpackages__",