mb/pcengines/apu1: use generic SPD

Clean up leftovers of old SPD generation and utilize
common procedure to produce SPD binary.

Change-Id: I4e48817c03b4372887bc0ea14209736ae2b4e48f
Signed-off-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Reviewed-on: https://review.coreboot.org/27301
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
4 files changed