Revert changes to use onf-make

onf-make was never compatible with this repo. For now, we want to
revert these changes so that the build can work properly again.

Signed-off-by: Eric Ball <eball@linuxfoundation.org>
Change-Id: I0afb08030edcae4d2e968c63ef5eb11e17085d8a
diff --git a/VERSION b/VERSION
index 965a689..14239ef 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.13.4
+2.13.6