use gitlab helper module

ee/lib/ee/gitlab/geo_git_access.rb

 module EE
   module Gitlab
     module GeoGitAccess
+      include ::Gitlab::ConfigHelper
       include ::EE::GitlabRoutingHelper
 
       GEO_SERVER_DOCS_URL = 'https://docs.gitlab.com/ee/gitlab-geo/using_a_geo_server.html'.freeze
@@ -33,10 +34,6 @@ module EE
       def project_or_wiki
         self.class.name == 'Gitlab::GitAccessWiki' ? @project.wiki : @project
       end
-
-      def gitlab_config
-        ::Gitlab.config.gitlab
-      end
     end
   end
 end