build: Support modern bitbake syntax for override
This will enable support for kirstone branch and still remain compatible with honister.
Recipes were converted using poky/src/poky/scripts/contrib/convert-overrides.py
Relate-to: https://github.com/meta-flutter/meta-flutter/pull/67 Relate-to: https://docs.yoctoproject.org/migration-guides/migration-3.4.html#override-syntax-changes Thanks-to: Simon Kuhnle <@snke> Signed-off-by: Philippe Coval philippe.coval@huawei.com