examples/updated.xml: Add a kernel

Needed to boot the resulting disk image.

Signed-off-by: Stefan Gast <stefan.gast@linutronix.de>
docs: Fix mis-merge in elbe-gen_update.txt

Signed-off-by: Stefan Gast <stefan.gast@linutronix.de>
Revert "gen_update: Include new version number in new.xml"

This reverts commit 260d24ea479b8bf3d642cca63ddf7a307c523d63.

We now get the version number from the source.xml file of the project,
so this is no longer needed.

Conflicts:
	elbepack/updatepkg.py

Signed-off-by: Stefan Gast <stefan.gast@linutronix.de>