Add a basic raspberry pi test.test/better-oe-selftest

There's not much we can do, since booting the device via a test is not
practical. Still, it's useful to make sure that we can build the image.
If trying to build the image in an environment designed for qemu, this
takes some trickery to set things up just right.

Also consistently set up layers before setting the MACHINE, since the
sanity checker sometimes complains otherwise.

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