lib/spd: isolate non-spd module files so they don't need owner's review

When a platform using non-SPD DRAM is going to add a second sourced
memory, they usually need to change the lib/nonspd.h and
lib/nonspd_modules.c. The 'module data' should not need owner's review.

BUG=None
TEST=emerge-$BOARD mosys

Change-Id: Ief7a14ae7209a0e33e0b03d34ed6467326c9b907
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/mosys/+/2809688
Tested-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Auto-Submit: Hung-Te Lin <hungte@chromium.org>
Commit-Queue: Hung-Te Lin <hungte@chromium.org>
5 files changed