CI: add missing smoke test flag in yocto.groovy
CI: add missing smoke test flag in yocto.groovy

The smokeTests flag did not have a default which caused errors
when using buildWithLayer.

Signed-off-by: Therese Nordqvist <2d0f96d8a993fd0656366c2e00899126ff42525a@pelagicore.com>

Pelagicore/pelux-manifests,sashko/pelux-manifests