default.xml: Update meta-seco-imx to dunfell branch

This change enable graphics support for C61

Relate-to: https://gitlab.eclipse.org/groups/eclipse-wg/oniro-wg/proposal-incubation-stage-oniro/-/wikis/UI Forwarded: https://gitlab.eclipse.org/eclipse/oniro-core/oniro/-/merge_requests?author_username=pcoval&scope=all&state=all Signed-off-by: Philippe Coval philippe.coval.ext@huawei.com