ci/panfrost: switch to 6.11 with timestamp patches for traces

Timestamp implementation is now available when switching to the Linux 6.11 + patches,
so traces requiring timestamp feature works again properly.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/11912
Reviewed-by: Vignesh Raman <vignesh.raman@collabora.com>
Signed-off-by: David Heidelberg <david@ixit.cz>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31260>

src/panfrost/ci/gitlab-ci.yml

@@ -312,6 +312,11 @@ panfrost-t860-traces:arm64:
     - .panfrost-test
     - .lava-rk3399-gru-kevin:arm64
     - .panfrost-traces
+  variables:
+    # force fixed kernel until 6.11 is switched officially
+    FORCE_KERNEL_TAG: "v6.11-rc7-mesa-3fb8"
+    KERNEL_IMAGE_BASE: https://${S3_HOST}/${S3_KERNEL_BUCKET}/${KERNEL_REPO}/${FORCE_KERNEL_TAG}
+
 
 panfrost-g52-gl:arm64:
   parallel: 3