Remove //y20*/prime

They were packages which each had a single rule and no source files.

Change-Id: Ic9a6f1764ae42eb773af4f5c1ba882bd4cd926d2
diff --git a/y2014/BUILD b/y2014/BUILD
index cfdbda1..4ef2430 100644
--- a/y2014/BUILD
+++ b/y2014/BUILD
@@ -1,9 +1,8 @@
-package(default_visibility = ['//visibility:public'])
-
 load('/aos/downloader/downloader', 'aos_downloader')
 
 cc_library(
   name = 'constants',
+  visibility = ['//visibility:public'],
   srcs = [
     'constants.cc',
   ],