tf-a-lts2.8-builder: Re-enabled UBL licensing for ArmClang

Now that license rollover for the next year happened and was confirmed.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: If3e9cc7aec60e485264c8f59655845ea5a7e0be9
diff --git a/tf-a-lts2.8-builder.yaml b/tf-a-lts2.8-builder.yaml
index bd93506..b715e52 100644
--- a/tf-a-lts2.8-builder.yaml
+++ b/tf-a-lts2.8-builder.yaml
@@ -102,10 +102,10 @@
             - text:
                 credential-id: LAVA_TOKEN_TF
                 variable: LAVA_TOKEN
-#        - credentials-binding:
-#            - text:
-#                credential-id: ARMCLANG_UBL_CODE
-#                variable: ARMCLANG_UBL_CODE
+        - credentials-binding:
+            - text:
+                credential-id: ARMCLANG_UBL_CODE
+                variable: ARMCLANG_UBL_CODE
     builders:
         - shell: |
             aarch64-none-elf-gcc -v || true