soc/amd/stoneyridge: Add mainboard call for SPD values

Add a mainboard function call to write the AGESA SPD buffer.
Removes the unneccesary dimm_spd.c file.

BUG=b:67845441

Change-Id: Id42622008b49b4559e648a7fa1bfd9f26e1f56a4
Signed-off-by: Marc Jones <marcj303@gmail.com>
Reviewed-on: https://review.coreboot.org/22485
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
4 files changed