amd/stoneyridge: Add NV storage to ramtop

The scratch registers in northbridge used for storing the top of
cacheable memory are volatile.  Use the BiosRam storage in the FCH
instead.

TEST=Suspend and resume Kahlee with complete S3 patch stack
BUG=b:69614064

Change-Id: Ieb3cfd173c70bf899a6391d62d1df87b38485f30
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/22726
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
3 files changed