soc/amd/picasso: only link soc_util in ramstage

No code that was or will be upstreamed uses functionality from soc_util
in romstage, so only compile and link it for ramstage.
This also allows to fix the SoC type detection in a follow-up patch
using information that FPS-M will be providing in a HOB.

BUG=b:153779573

Change-Id: If96e53608eadd562f6de5a0c370b89e84e43d049
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41430
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

0 files changed, 0 insertions, 0 deletions