Use the device's architecture instead of noarch. Because the device
packages should never be built for other architectures, even if all
depends can be built for other arches as well.
This simplifies package building as part of the new build
infrastructure effort.
pmbootstrap has also been changed to output this by default in
aportgen.
Kernel is downstream. System boots. Flash the device using the netcat
method to an external SD (use the entire SD, not a partition, as the
target device) because the internal memory is too small.
