amd/stoneyridge: Add S3 support to POST

Add/update the romstage and ramstage paths to check for S3 resume
and call the appropriate AGESA functions.

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

Change-Id: Ie6ae66f88b888fff3a800b4ed55dd1f6fed712b2
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/22731
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
4 files changed