genericx86-64.coffee: Set yocto version to thud
genericx86-64.coffee: Set yocto version to thud

Changelog-entry: Update to yocto thud
Signed-off-by: Andrei Gherzan <8dc7c09356db0b1762fb140617d7375c0a5a4131@balena.io>

resin-os/resin-intel