Add unit tests for android/neverallow.go

Bug: 74506774
Test: lunch aosp_walleye-userdebug && make  # runs unit tests
Change-Id: Ibde685d7213713be219681cb039ad58a43d9c377
diff --git a/Android.bp b/Android.bp
index 1d2c516..00db8f2d 100644
--- a/Android.bp
+++ b/Android.bp
@@ -71,6 +71,7 @@
         "android/config_test.go",
         "android/expand_test.go",
         "android/namespace_test.go",
+        "android/neverallow_test.go",
         "android/paths_test.go",
         "android/prebuilt_test.go",
         "android/util_test.go",