soc/amd/common: Add S3 supporting functions

Add functions that the wrapper will call to get and save the S3 data.
The wrapper requires two types of data saved:
 * Non-volatile:  Information that is the minimum required for bringing
   the DRAM controller back online.  This change uses the common
   mrc_cache driver to manage the storage
 * Volatile:  May be stored in DRAM; information required to complete
   the system restoration process.

TEST=Suspend/Resume Kahlee with complete S3 patch stack
BUG=b:69614064

Change-Id: Ie60162ea10f053393bc84e927dbd80c9279e6b63
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/22727
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

0 files changed, 0 insertions, 0 deletions