Reported by Nikolaus Schaller, Feb 16, 2019

firstly, we can certainly remode no longer used kernel arguments 
like those for omapfb.

Next it is interesting to check what we really need as differences 
for RasPi and Udoo Neo. Those defconfigs are currently automatically 
built from letux_defconfig and it appears that they only indert 
slightly different kernel arguments, especially the 
console=ttySomething definition.

This console definition should be done either by U-Boot (boot.scr or 
uEnv.txt). Or it should be set by the chosen / stdout-path in case 
of earlycon.

If this is successful we might be able to use a single 
letux_defconfig for all OMAP, i.MX6 and Broadcom boards we support.

This will not only compile faster but save variants in the download 
section and will resolve the different Debian kernel packages into a 
single one.