Revert "ci: Disable panfrost t760"

The devices have been running KernelCI jobs for a good while without
glitches, let's reenable Mesa jobs on them now.

This reverts commit c6fbbbbf70.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Acked-by: Michel Dänzer <mdaenzer@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10173>

src/gallium/drivers/panfrost/ci/gitlab-ci.yml

@@ -10,7 +10,7 @@ panfrost-t720-gles2:arm64:
   tags:
     - mesa-ci-aarch64-lava-collabora
 
-.panfrost-t760-gles2:armhf:
+panfrost-t760-gles2:armhf:
   extends:
     - .lava-test:armhf
     - .panfrost-rules
@@ -24,7 +24,7 @@ panfrost-t720-gles2:arm64:
   tags:
     - mesa-ci-aarch64-lava-collabora
 
-.panfrost-t760-traces:armhf:
+panfrost-t760-traces:armhf:
   extends:
     - .lava-piglit-traces:armhf
     - .panfrost-rules