Add a dumb PCB as a starting point for a testing jig

Two boards can be used back to back, linked by a set of 40 pins.
One boards carries the Pico, the other one carries a set of pogo
pins where the CS board sits.

Yes, that's a 4 board sandwich. Must be tasty.

Signed-off-by: Marc Zyngier <maz@kernel.org>
10 files changed