Define default values for tf-m-tests & extras

Change-Id: I071f25a788a5fe45b5d2732b5f1d73a977148b74
diff --git a/scripts/clone.sh b/scripts/clone.sh
index d984a66..b485817 100755
--- a/scripts/clone.sh
+++ b/scripts/clone.sh
@@ -44,6 +44,8 @@
 # Default Reference specs
 TF_GERRIT_REFSPEC="${TF_GERRIT_REFSPEC:-${REFSPEC_MASTER}}"
 TFTF_GERRIT_REFSPEC="${TFTF_GERRIT_REFSPEC:-${REFSPEC_MASTER}}"
+TF_M_TESTS_GERRIT_REFSPEC="${TF_M_TESTS_GERRIT_REFSPEC:-${REFSPEC_MASTER}}"
+TF_M_EXTRAS_GERRIT_REFSPEC="${TF_M_EXTRAS_GERRIT_REFSPEC:-${REFSPEC_MASTER}}"
 CI_REFSPEC="${CI_REFSPEC:-${REFSPEC_MASTER}}"
 JOBS_REFSPEC="${JOBS_REFSPEC:-${REFSPEC_MASTER}}"