Rename neverallow_test.go to sepolicy_neverallow

Because Go command line tooling assumes *_test.go files are tests and
not package sources.

Test: build
Change-Id: Ie332b89140b93c4ea448009cafa2556ef888497c
diff --git a/build/soong/Android.bp b/build/soong/Android.bp
index ea11e1f..8518d4d 100644
--- a/build/soong/Android.bp
+++ b/build/soong/Android.bp
@@ -36,11 +36,11 @@
         "cil_compat_map.go",
         "compat_cil.go",
         "filegroup.go",
-        "neverallow_test.go",
         "policy.go",
         "selinux.go",
         "selinux_contexts.go",
         "sepolicy_freeze.go",
+        "sepolicy_neverallow.go",
         "sepolicy_vers.go",
         "versioned_policy.go",
     ],
diff --git a/build/soong/neverallow_test.go b/build/soong/sepolicy_neverallow.go
similarity index 100%
rename from build/soong/neverallow_test.go
rename to build/soong/sepolicy_neverallow.go