Add CB_NOSPD build-time option

This option is required for platforms with soldered memory chips. This
should be detected at run time, but scanning SMBus on some platforms
(ie. PC Engines APU2) can be dangerous and leads to freeze.

Change-Id: Ie5476d87d9a9e31757c80c4cc67031eec7accd03
Signed-off-by: Andrzej Pawlowicz <andrzej.pawlowicz@3mdeb.com>
Signed-off-by: Piotr Król <piotr.krol@3mdeb.com>
Reviewed-on: https://review.coreboot.org/19053
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
3 files changed