x86-64-TF-04: add new agent and revert the label approach

Signed-off-by: Benjamin Copeland <ben.copeland@linaro.org>
Change-Id: Id6204dc66f916a65d7917c880f172e02cee962bd
diff --git a/ci-dockerslaves-cleanup.yaml b/ci-dockerslaves-cleanup.yaml
index 77166c3..88a9e45 100644
--- a/ci-dockerslaves-cleanup.yaml
+++ b/ci-dockerslaves-cleanup.yaml
@@ -28,9 +28,12 @@
     axes:
         - axis:
             type: slave
-            name: label
+            name: nodes
             values:
-                - build-amd64
+                - x86_64-TF-01
+                - x86_64-TF-02
+                - x86-64-TF-03
+                - x86-64-TF-04
     execution-strategy:
         sequential: false
     wrappers: