panvk/ci: Disable CI for a while

We have been hitting OOM conditions quite often and this is making ti
hard to get stuff merged.
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <!16554>

src/panfrost/ci/gitlab-ci.yml

@@ -108,7 +108,7 @@ panfrost-g52-gl:arm64:
     DEQP_SUITE: panfrost-g52
     PAN_MESA_DEBUG: "deqp,sync,indirect"
 
-panfrost-g52-vk:arm64:
+.panfrost-g52-vk:arm64:
   extends:
     - .lava-test:arm64
     - .lava-meson-g12b-a311d-khadas-vim3