The armel/marvell kernel size is growing to large and the compressed
image is over the limit.
Given the armel architecture will most likely not be part of Buster,
disable the image build.
Cf. https://lists.debian.org/debian-kernel/2018/01/msg00278.html
Use kernel-wedge in gencontrol.py and during the build process to
generate the udeb packages required by debian-installer.
Add the kernel-wedge configuration files from all the current
linux-kernel-di-$arch-2.6 packages.
svn path=/dists/trunk/linux-2.6/; revision=18121