meta-schulung: add thud support, create separate branches

The meta-schulung.bundle now includes separate branches depending
on the poky release. This was necessary because thud introduced
a new busybox dependency (virtual/crypt).

One nice feature of this splitting is that it is very easy to
see how the layer changes over poky versions by diffing the
branches.

Signed-off-by: John Ogness <john.ogness@linutronix.de>

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