[VOL-5308] - bbsim test failure

Makefile
--------
  o Temporary flag USE_LF_MK=1 added to enable library repo:onf-make use.
  o Default behavior will use legacy makefiles from  repo:bbsim/makefiles/.
  o Fixed typo on line 76

lf/include.mk
makefiles/
-------------
  o Transition bridge for using repo:onf-make.
  o Define variable legacy-mk= as bbsim/makefiles/
  o Replace path variable $(MAKEDIR=) with $(legacy-mk).
  o Replace variable $(ONF_MAKEDIR=) with $(legacy-mk).
  o These edits help break dependency on non-library makefiles/ directory.
    allowing repo:onf-make to be used as a transparent replacement.

Change-Id: Ida8c020384cf78ddf19fa6375702429d992d10a1
Signed-off-by: Joey Armstrong <jarmstrong@linuxfoundation.org>
diff --git a/makefiles/golang/include.mk b/makefiles/golang/include.mk
index 7ce9b66..53fe57b 100644
--- a/makefiles/golang/include.mk
+++ b/makefiles/golang/include.mk
@@ -21,6 +21,6 @@
 # ONF.makefiles.include.version = 1.1
 # -----------------------------------------------------------------------
 
-include $(ONF_MAKEDIR)/golang/mod-update.mk
+include $(legacy-mk)/golang/mod-update.mk
 
 # [EOF]