Documentation: Add PC Engines apu1

Describe how to run coreboot on the PC Engines apu1 mainboard.

Change-Id: If79693e893c4afe52bf1c9aa8017ac6f650a96e4
Signed-off-by: Piotr Kleinschmidt <piotr.kleinschmidt@3mdeb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32907
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

1 files changed, 0 insertions, 0 deletions

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