default.xml: Update revision on meta-seco-rockchip

Use branch (dunfell) instead of the revision hash Signed-off-by: Natalia Kovalenko waykovalenko@gmail.com

I'll rebase dunfell branch on main then please confirm working sha1 in dunfell branch

By Phil Coval on 2022-06-07T16:11:33 (imported from GitLab)

mentioned in commit 2bc6bbbf

By Phil Coval on 2022-06-07T16:10:01 (imported from GitLab)