Revert "CI: temp disable t720/t760 jobs."

There was an unresponsive server in Collabora's LAVA lab that has been
rebooted. Everything seems to be fine now.

This reverts commit f1001a3827.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6342>

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

@@ -149,7 +149,7 @@ kernel+rootfs_armhf:
   extends:
     - .lava-test:arm64
 
-.panfrost-t720-gles2:arm64:
+panfrost-t720-gles2:arm64:
   extends:
     - .lava-test:arm64
     - .panfrost-rules
@@ -161,7 +161,7 @@ kernel+rootfs_armhf:
   tags:
     - mesa-ci-aarch64-lava-collabora
 
-.panfrost-t760-gles2:armhf:
+panfrost-t760-gles2:armhf:
   extends:
     - .lava-test:armhf
     - .panfrost-rules