Add honister support
This PR introduces the new override syntax required for honister. The new syntax support has been backported to dunfell, gatesgarth & hardknott by yocto project. This change does imply dropping support for zues & warrior
This PR introduces the new override syntax required for honister. The new syntax support has been backported to dunfell, gatesgarth & hardknott by yocto project. This change does imply dropping support for zues & warrior