Simplify the Jenkinsfile
Simplify the Jenkinsfile

Some values can be calculated automatically from given in-params. Also
makes the shown stage names include the BSP so that when building for
several archs it will be easier to see that the stages are different.

Signed-off-by: Tobias Olausson <e5abfa285347082f76013504c37f988d1046765a@pelagicore.com>

Pelagicore/pelux-manifests,sashko/pelux-manifests,DunderRoffe/pelux-manifests