CI: Re-enable Panfrost T860 jobs

The lab is back online.

This reverts commit 34db50558d.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5694>

.gitlab-ci/lava-gitlab-ci.yml

@@ -104,7 +104,7 @@ panfrost-t760-gles2:armhf:
   tags:
     - mesa-ci-aarch64-lava-collabora
 
-.panfrost-t860-gles2:arm64:
+panfrost-t860-gles2:arm64:
   extends:
     - .lava-test:arm64
     - .panfrost-rules
@@ -119,7 +119,7 @@ panfrost-t760-gles2:armhf:
   tags:
     - mesa-ci-aarch64-lava-collabora
 
-.panfrost-t860-gles3:arm64:
+panfrost-t860-gles3:arm64:
   extends:
     - .lava-test:arm64
     - .panfrost-rules