Fix issue with make targets

Fix issue where make would only pull/checkout the repo's if they didn't
already exist. If there is a file or folder with the same name as the make
target, make will not run the make target.

Change-Id: I44dd324048dd910fec59df8431fb93b5741225bb
diff --git a/Makefile b/Makefile
index f809c8e..7b22c13 100644
--- a/Makefile
+++ b/Makefile
@@ -128,7 +128,7 @@
   FABRIC_TNA_REPO = https://onos-builder:${ONOS_BUILDER_API}@github.com/stratum/fabric-tna.git
 endif
 
-.PHONY:
+.PHONY: onos trellis-control trellis-t3 fabric-tofino up4 kafka-onos fabric-tna
 
 .SILENT: up4 fabric-tna