CI: Disable Panfrost T760

For some unknown reason, both RK3288 Chromebooks went catatonic over the
weekend. Disable them until we can get them fixed.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7508>
diff --git a/.gitlab-ci/lava-gitlab-ci.yml b/.gitlab-ci/lava-gitlab-ci.yml
index 2cfe619..e7cf14c 100644
--- a/.gitlab-ci/lava-gitlab-ci.yml
+++ b/.gitlab-ci/lava-gitlab-ci.yml
@@ -172,7 +172,7 @@
   tags:
     - mesa-ci-aarch64-lava-collabora
 
-panfrost-t760-gles2:armhf:
+.panfrost-t760-gles2:armhf:
   extends:
     - .lava-test:armhf
     - .panfrost-rules